WO2023228879A1

WO2023228879A1 - Flexible wiring board unit and dimmer unit

Info

Publication number: WO2023228879A1
Application number: PCT/JP2023/018710
Authority: WO
Inventors: 真樹辻; 秀司佐藤; 玄中村
Original assignee: 凸版印刷株式会社
Priority date: 2022-05-23
Filing date: 2023-05-19
Publication date: 2023-11-30

Abstract

This flexible wiring board unit comprises: a first flexible wiring board that extends in a first direction; and a second flexible wiring board that extends in a second direction. The second flexible wiring board is configured to be electrically connected to the first flexible wiring board such that the first and second directions intersect each other at a first end of the second flexible wiring board in the second direction. The first flexible wiring board comprises first and second bonding terminals arranged in the first direction. The first and second bonding terminals are configured to be connected to an object to which power is to be supplied. The second flexible wiring board comprises first and second power source terminals positioned at the second end opposite to the first end in the second direction. The first and second power source terminals are configured to be connected to an external power source.

Description

Flexible wiring board unit and dimming unit

The present disclosure relates to a flexible wiring board unit including a plurality of electrically connectable flexible wiring boards, and a light control unit including the flexible wiring board unit.

The light control sheet includes two transparent electrode sheets and a light control layer located between the two transparent electrode sheets. Each transparent electrode sheet includes an electrode terminal. The electrode terminal is a portion of one transparent electrode sheet that is exposed from the light control layer and the other transparent electrode sheet. The electrode terminal provided on each transparent electrode sheet is located at the edge provided on the light control sheet. One bonded terminal provided on a flexible wiring board is bonded to each electrode terminal (see, for example, Patent Documents 1 and 2). In the light control sheet, by applying a voltage between two transparent electrode sheets through a flexible wiring board, the light transmittance of the light control layer is changed compared to before the voltage is applied.

For example, as shown in FIG. 30, the light control sheet 300 is located between the first transparent electrode sheet 310, the second transparent electrode sheet 320, and between the first transparent electrode sheet 310 and the second transparent electrode sheet 320. and a light control layer. Note that in FIG. 30, the first transparent electrode sheet 310 is located on the front side of the paper with respect to the second transparent electrode sheet 320. Further, in FIG. 30, for convenience of explaining the shape of each sheet, the first transparent electrode sheet 310 is shown by thick lines, and the second transparent electrode sheet 320 is shown by thin lines.

The first transparent electrode sheet 310 includes a first terminal 310P. The first terminal 310P is a portion where a part of the first transparent electrode sheet 310 is exposed from the second transparent electrode sheet 320 and the light control layer, as shown by the broken line in FIG. Note that the first terminal 310P faces toward the back of the page in FIG. 30. The second transparent electrode sheet 320 includes a second terminal 320P. The second terminal 320P is a part where a part of the second transparent electrode sheet 320 is exposed from the first transparent electrode sheet 310 and the light control layer, as shown by dots in FIG. The second terminal 320P faces toward the front side of the page in FIG. 30.

The light control sheet 300 includes one edge 300E extending along the first direction D1. The first terminal 310P and the second terminal 320P are arranged in parallel on the edge 300E. A cutout 300E1, which is a part of the edge 300E, is provided between the first terminal 310P and the second terminal 320P.

The light control sheet 300 is connected to an external power source 340 through a flexible wiring board 330. The flexible wiring board 330 is a flexible printed circuit (FPC). The flexible wiring board 330 includes a first portion 331 and a second portion 332. The first portion 331 extends along the first direction D1. The second portion 332 extends from the center of the first portion 331 in the first direction D1 to the side opposite to the light control sheet 300 along the second direction D2 orthogonal to the first direction D1. The flexible wiring board 330 has a substantially T-shaped outer shape due to the first portion 331 and the second portion 332.

The first portion 331 includes a first bonded terminal 331P1 and a second bonded terminal 331P2. The first adhered terminal 331P1 is provided at the first end of the first portion 331 in the first direction D1. The second adhered terminal 331P2 is provided at a second end of the first portion 331 opposite to the first end in the first direction D1. The first adhered terminal 331P1 faces toward the front side of the page in FIG. 30. The first adhered terminal 331P1 is electrically connected to the first terminal 310P. The second adhered terminal 331P2 faces toward the back of the page in FIG. 30. The second adhered terminal 331P2 is electrically connected to the second terminal 320P.

The second portion 332 includes a first power terminal 332P1 and a second power terminal 332P2. The first power terminal 332P1 and the second power terminal 332P2 are provided at the tip of the second portion 332 in the second direction D2. The first power terminal 332P1 and the second power terminal 332P2 face toward the front side of the paper in FIG. 30. The first power terminal 332P1 is electrically connected to the first bonded terminal 331P1 inside the flexible wiring board 330. The second power terminal 332P2 is electrically connected to the second bonded terminal 331P2 inside the flexible wiring board 330. The first power terminal 332P1 and the second power terminal 332P2 are electrically connected to the external power supply 340. The external power source 340 applies a voltage between the first transparent electrode sheet 310 and the second transparent electrode sheet 320 via the flexible wiring board 330. This causes the light control layer to change the light transmittance.

Japanese Patent Application Publication No. 2007-57925 JP2020-38265A

As shown in FIG. 31, when manufacturing a flexible wiring board 330, a plurality of flexible wiring boards are placed in a laminated sheet 400 formed by sandwiching a conductor between two layers of resin material. 330 is imposed. In the example shown in FIG. 31, adjacent flexible wiring boards 330 are arranged alternately along the second direction D2 in a state in which they are reversed by 180 degrees.

In manufacturing the flexible wiring board 330, since the ratio of the area used as the flexible wiring board 330 to the entire area of the laminated sheet 400 is small, it is desired to improve the yield. In particular, as the light control sheet 300 becomes larger, the larger the width W331 of the first portion 331 along the first direction D1 becomes, the more the area used as the flexible wiring board 330 is compared to the area of the laminated sheet 400. The proportion of Similarly, as the width W332 of the second portion 332 along the second direction D2 increases, the ratio of the area used as the flexible wiring board 330 to the entire area of the laminated sheet 400 decreases.

In one aspect, a flexible wiring board unit is provided. The flexible wiring board unit is a flexible wiring board unit and includes a first flexible wiring board extending in a first direction and a second flexible wiring board extending in a second direction, The second flexible wiring board is arranged such that the first direction and the second direction intersect at a first end of the second flexible wiring board in the second direction. The first flexible wiring board is configured to be electrically connected to a flexible wiring board, and the first flexible wiring board includes a first bonded terminal and a second bonded terminal arranged in the first direction, and The first bonded terminal and the second bonded terminal are configured to be connected to a power supply target, and the second flexible wiring board has an end opposite to the first end in the second direction. A first power terminal and a second power terminal are provided at the second end, and the first power terminal and the second power terminal are configured to be connected to an external power source.

In another aspect, a dimming unit is provided. The light control unit includes a light control sheet having an edge extending in a first direction, a flexible wiring board unit adhered to the edge, and the light control sheet includes a first transparent electrode sheet, a second transparent electrode sheet; a light control layer located between the first transparent electrode sheet and the second transparent electrode sheet; The portion exposed from the transparent electrode sheet is a first electrode terminal, the portion of the second transparent electrode sheet exposed from the light control layer and the first transparent electrode sheet is a second electrode terminal, and the portion of the second transparent electrode sheet exposed from the light control layer and the first transparent electrode sheet is a second electrode terminal. A terminal and the second electrode terminal are arranged along the first direction at the edge, and the flexible wiring board unit includes a first flexible wiring board extending in the first direction, and a first flexible wiring board extending in the second direction. a second flexible wiring board extending in the second direction, the second flexible wiring board extending in the first direction at a first end of the second flexible wiring board in the second direction; The first flexible wiring board is configured to be electrically connected to the first flexible wiring board so as to intersect with the second direction, and the first flexible wiring board is connected to the first flexible wiring board along the first direction. The first bonded terminal includes a first bonded terminal and a second bonded terminal, the first bonded terminal is configured to be electrically connected to the first electrode terminal, and the second bonded terminal is configured to be electrically connected to the first bonded terminal. The second flexible wiring board is configured to be electrically connected to a two-electrode terminal, and the second flexible wiring board has a second end located at a second end opposite to the first end in the second direction. The power supply terminal includes a first power supply terminal and a second power supply terminal, and the first power supply terminal and the second power supply terminal are configured to be connected to an external power supply.

FIG. 1 is a plan view of the light control unit of the first embodiment. FIG. 2 is a cross-sectional view taken along line II-II in FIG. FIG. 3 is a cross-sectional view taken along line III--III in FIG. 1. FIG. 4 is a plan view of the first flexible wiring board and the second flexible wiring board included in the flexible wiring board unit of the first embodiment. FIG. 5 is a plan view showing an example of the imposition of the first flexible wiring board of the first embodiment. FIG. 6 is a cross-sectional view of the first laminated sheet for manufacturing the first flexible wiring board of the first embodiment. FIG. 7 is a plan view showing an example of the imposition of the second flexible wiring board of the first embodiment. FIG. 8 is a cross-sectional view of the second laminated sheet for manufacturing the second flexible wiring board of the first embodiment. FIG. 9 is a plan view of the light control unit of the second embodiment. FIG. 10 is a cross-sectional view taken along line XX in FIG. 9. FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. FIG. 12 is a plan view of the first flexible wiring board included in the flexible wiring board unit of the second embodiment. FIG. 13 is an enlarged view of the main part showing the first relay terminal of the first flexible wiring board of the second embodiment. FIG. 14 is a plan view of the second flexible wiring board included in the flexible wiring board unit of the second embodiment. FIG. 15 is an enlarged view of the main part showing the third relay terminal of the second flexible wiring board of the second embodiment. FIG. 16 is a schematic diagram showing the relative positional relationship between the first relay terminal and the third relay terminal in a state where the first relay terminal and the third relay terminal are bonded together in the second embodiment. FIG. 17 is a plan view of the light control unit of the third embodiment. FIG. 18 is a cross-sectional view taken along line XVIII-XVIII in FIG. 17. FIG. 19 is a sectional view taken along line XIX-XIX in FIG. 17. FIG. 20 is a plan view of the first flexible wiring board of the third embodiment. FIG. 21 is a plan view of the second flexible wiring board of the third embodiment. FIG. 22 is a plan view of the first flexible wiring board of the fourth embodiment. FIG. 23 is a plan view of the first flexible wiring board of the fifth embodiment. FIG. 24 is a plan view of the first flexible wiring board of the fifth embodiment. FIG. 25 is a plan view of the first flexible wiring board of the sixth embodiment. FIG. 26 is a plan view of the first flexible wiring board of the sixth embodiment. FIG. 27 is a plan view of the first flexible wiring board of the seventh embodiment. FIG. 28 is a plan view of the first flexible wiring board of the seventh embodiment. FIG. 29 is a plan view of the second flexible wiring board of the seventh embodiment. FIG. 30 is a plan view showing a conventional example of a light control sheet and a flexible wiring board. FIG. 31 is a plan view showing an example of imposition of the flexible wiring board shown in FIG. 30.

[Dimmer unit of first embodiment]
The light control unit of the first embodiment will be described below with reference to FIGS. 1 to 8.
As shown in FIG. 1, the light control unit 1 of the first embodiment includes a light control sheet 10 and a flexible wiring board unit 50. The light control sheet 10 includes one edge 10E extending in the first direction D1. The flexible wiring board unit 50 is connected to the edge 10E of the light control sheet 10.

The light control sheet 10 includes a first transparent electrode sheet 20 and a second transparent electrode sheet 30. In FIG. 1, the first transparent electrode sheet 20 is located on the front side of the paper with respect to the second transparent electrode sheet 30. In FIG. 1, the second transparent electrode sheet 30 is located on the back side of the paper with respect to the first transparent electrode sheet 20. In addition, in FIG. 1, for convenience of explaining the relative positions of the first transparent electrode sheet 20 and the second transparent electrode sheet 30, the first transparent electrode sheet 20 is shown by a thick line, and the second transparent electrode sheet 30 is shown by a thick line. Indicated by a thin line.

The light control sheet 10 divides the space in which the light control sheet 10 is located into two. In FIG. 1, of the two spaces partitioned by the light control sheet 10, the space on the front side of the paper that is in contact with the first transparent electrode sheet 20 is the first space. In FIG. 1, of the two spaces partitioned by the light control sheet 10, the space on the back side of the plane of the paper that is in contact with the second transparent electrode sheet 30 is the second space.

The light control sheet 10 includes a first electrode terminal 22P and a second electrode terminal 32P. The first electrode terminal 22P is a portion of the first transparent electrode sheet 20 that is exposed from the second transparent electrode sheet 30. The first electrode terminal 22P faces the second space (the back side of the paper in FIG. 1). The second electrode terminal 32P is a portion of the second transparent electrode sheet 30 that is exposed from the first transparent electrode sheet 20. The second electrode terminal 32P faces the first space (the front side of the paper in FIG. 1). The first electrode terminal 22P and the second electrode terminal 32P are lined up at a distance along the first direction D1. In addition, in FIG. 1, the first electrode terminal 22P is surrounded by a broken line, and the second electrode terminal 32P is marked with a dot.

The edge 10E includes a notch 10A. The notch 10A is a recessed portion in which a part of the edge 10E is depressed toward the inside of the light control sheet 10 from the edge 10E. The notch 10A is located between the first electrode terminal 22P and the second electrode terminal 32P at the edge 10E.

The flexible wiring board unit 50 includes a first flexible wiring board 60 extending in the first direction D1 and a second flexible wiring board 70 extending in the second direction D2 intersecting the first direction D1. The second direction D2 is perpendicular to the first direction D1, for example. The first flexible wiring board 60 and the second flexible wiring board 70 are each one flexible printed circuit board (FPC).

The first flexible wiring board 60 includes a first bonded terminal 61P and a second bonded terminal 62P. The first bonded terminal 61P includes, for example, tooth terminals arranged in a comb-teeth shape at a predetermined pitch along the first direction D1. The first adhered terminal 61P is located on the second space side (the back side of the paper in FIG. 1) with respect to the first electrode terminal 22P. The first bonded terminal 61P faces the first electrode terminal 22P and is bonded so as to be electrically connected to the first electrode terminal 22P.

The second bonded terminal 62P includes, for example, tooth terminals arranged in a comb-like shape at a predetermined pitch along the first direction D1. The second adhered terminal 62P is located on the first space side (on the near side of the paper in FIG. 1) with respect to the second electrode terminal 32P. The second bonded terminal 62P faces the second electrode terminal 32P and is bonded so as to be electrically connected to the second electrode terminal 32P.

The first bonded terminal 61P and the second bonded terminal 62P are lined up along the first direction D1 in the first flexible wiring board 60. The first adhered terminal 61P is located at one end of the first flexible wiring board 60 in the first direction D1. The second adhered terminal 62P is located at the other end of the first flexible wiring board 60 in the first direction D1. In other words, the first bonded terminal 61P is located at the first end of the first flexible wiring board 60 in the first direction D1. The second adhered terminal 62P is located at a second end of the first flexible wiring board 60 opposite to the first end in the first direction D1. In the first flexible wiring board 60, the first bonded terminal 61P is located in a second space with respect to the light control sheet 10 through the notch 10A, and the second bonded terminal 62P is located in the second space with respect to the light control sheet 10. It is arranged so that it is located in the first space with respect to the first space.

The first flexible wiring board 60 includes a convex portion 65. The convex portion 65 is located in the first flexible wiring board 60 between the first bonded terminal 61P and the second bonded terminal 62P in the first direction D1. The convex portion 65 protrudes toward the light control sheet 10 along the second direction D2. In the first direction D1, the width of the convex portion 65 is smaller than the width of the notch 10A. The convex portion 65 is located inside the notch 10A when the flexible wiring board unit 50 is attached to the light control sheet 10.

For example, when the convex portion 65 is arranged inside the notch 10A, it is preferable that the first adhered terminal 61P is appropriately arranged with respect to the first electrode terminal 22P in the first direction D1. At the same time, it is preferable that the second bonded terminal 62P is appropriately arranged with respect to the second electrode terminal 32P in the first direction D1. In this case, in the first direction D1, the flexible wiring board unit 50 can be attached to an appropriate position based on the arrangement of the convex portion 65 with respect to the notch 10A.

The second flexible wiring board 70 is arranged such that the first end of the second flexible wiring board 70 in the second direction D2 is located at the center of the first flexible wiring board 60 in the first direction D1. It is mechanically and electrically connected to the flexible wiring board 60. The second flexible wiring board 70 extends from the connection portion with the first flexible wiring board 60 along the second direction D2 to the opposite side to the light control sheet 10. The flexible wiring board unit 50 has a substantially T-shaped outer shape due to the first flexible wiring board 60 and the second flexible wiring board 70.

The second flexible wiring board 70 includes a first power terminal 73P and a second power terminal 74P. The first power terminal 73P and the second power terminal 74P are located at a second end opposite to the first end in the second direction D2. The first power supply terminal 73P and the second power supply terminal 74P are each connected to the external power supply 1A. The external power supply 1A applies a voltage between the first transparent electrode sheet 20 and the second transparent electrode sheet 30 via the flexible wiring board unit 50. Thereby, the light control sheet 10 changes the light transmittance.

[Cross-sectional structure of the light control sheet of the first embodiment]
As shown in FIG. 2, the light control sheet 10 includes a first transparent electrode sheet 20, a second transparent electrode sheet 30, and a light control layer 40. The first transparent electrode sheet 20 includes a first transparent base material 21 and a first transparent electrode layer 22. The second transparent electrode sheet 30 includes a second transparent base material 31 and a second transparent electrode layer 32. The light control layer 40 is located between the first transparent electrode layer 22 and the second transparent electrode layer 32. In the light control sheet 10, a first transparent base material 21, a first transparent electrode layer 22, a light control layer 40, a second transparent electrode layer 32, and a second transparent base material 31 are laminated in this order.

The first transparent base material 21 and the second transparent base material 31 have light transmittance to transmit visible light and electrical insulation. The material forming the first transparent base material 21 and the second transparent base material 31 is an organic polymer compound or an inorganic polymer compound. The organic polymer compound is, for example, at least one selected from the group consisting of polyester, polyacrylate, polycarbonate, and polyolefin. The inorganic polymer compound is, for example, at least one selected from the group consisting of silicon dioxide, silicon oxynitride, and silicon nitride.

The first transparent electrode layer 22 and the second transparent electrode layer 32 each have light transmittance to transmit visible light and conductivity. The materials forming the first transparent electrode layer 22 and the second transparent electrode layer 32 include, for example, indium tin oxide, fluorine-doped tin oxide, tin oxide, zinc oxide, carbon nanotubes, and poly 3,4-ethylenedioxythiophene. at least one selected from the group.

The light control layer 40 has different light transmittance before and after the voltage is applied through the first transparent electrode layer 22 and the second transparent electrode layer 32. An example of the light control layer 40 includes a transparent organic polymer layer and a liquid crystal composition. The transparent organic polymer layer defines a gap between the first transparent electrode layer 22 and the second transparent electrode layer 32. The liquid crystal composition fills the voids in the transparent organic polymer layer. The liquid crystal composition includes a liquid crystal compound. Examples of liquid crystal compounds include Schiff base compounds, azo compounds, azoxy compounds, biphenyl compounds, terphenyl compounds, benzoic acid ester compounds, tolan compounds, pyrimidine compounds, cyclohexanecarboxylic acid ester compounds, and phenyl compounds. At least one selected from the group consisting of cyclohexane compounds and dioxane compounds.

The type in which the transparent organic polymer layer holds the liquid crystal composition is, for example, one selected from the group consisting of a polymer network type, a polymer dispersed type, and a capsule type. In the polymer network type, the transparent organic polymer layer includes a transparent polymer network having a three-dimensional network structure, and holds the liquid crystal composition in the interconnected network voids. In the polymer dispersed type, the transparent organic polymer layer has a large number of isolated voids therein, and the liquid crystal composition is held in the voids dispersed in the transparent organic polymer layer. In the capsule type, a liquid crystal composition having a capsule shape is held in a transparent organic polymer layer. In addition, the liquid crystal composition may contain, in addition to the above-mentioned liquid crystal compound, a monomer for forming a transparent organic polymer layer and a dichroic dye.

The first electrode terminal 22P is a portion of the first transparent electrode layer 22 that is exposed from the second transparent electrode sheet 30 and the light control layer 40. The first bonded terminal 61P of the first flexible wiring board 60 is bonded to the first electrode terminal 22P via the first conductive adhesive 61A so as to be electrically connected thereto. The first conductive adhesive 61A is, for example, an anisotropic conductive film (ACF), an anisotropic conductive paste (ACP), an isotropic conductive film (ICF), and isotropic conductive paste (ICP).

A first sealing portion 61B for covering the end face of the light control layer 40 is provided on the first electrode terminal 22P. The first sealing portion 61B is made of resin having insulation properties. The material of the first sealing portion 61B is, for example, epoxy resin or acrylic resin. The first sealing portion 61B is in close contact with the first electrode terminal 22P, and is also in close contact with the end face of the second transparent electrode sheet 30 and the end face of the light control layer 40.

As shown in FIG. 3, the second electrode terminal 32P is a portion of the second transparent electrode layer 32 that is exposed from the first transparent electrode sheet 20 and the light control layer 40. A second bonded terminal 62P of the first flexible wiring board 60 is bonded to the second electrode terminal 32P via a second conductive adhesive 62A so as to be electrically connected thereto. As the material of the second conductive adhesive 62A, for example, the same kind of material as the first conductive adhesive 61A can be used.

A second sealing portion 62B for covering the end face of the light control layer 40 is provided on the second electrode terminal 32P. The second sealing portion 62B is made of an insulating resin, and for example, epoxy resin, acrylic resin, or the like can be used. The second sealing portion 62B is in close contact with the second electrode terminal 32P, and is also in close contact with the end face of the first transparent electrode sheet 20 and the end face of the light control layer 40. The first sealing part 61B and the second sealing part 62B prevent the liquid crystal composition forming the light control layer 40 from leaking outside by covering the end face of the light control layer 40, and also prevent the liquid crystal composition from leaking to the outside. Prevents deterioration caused by acids, moisture, ultraviolet rays, etc.

[Flexible wiring board unit of first embodiment]
As shown in FIG. 4, in the flexible wiring board unit 50, the first flexible wiring board 60 and the second flexible wiring board 70 are arranged so that the first direction D1 and the second direction D2 intersect. are electrically connected. In the first flexible wiring board 60, a width W1 along the first direction D1 is larger than a width W2 along the second direction D2. In the second flexible wiring board 70, a width W4 along the second direction D2 is larger than a width W3 along the first direction D1. The width W3 is, for example, less than 50% of the width W1, for example, 30% or less. The width W2 is, for example, less than 50% of the width W4, for example, 30% or less.

The first flexible wiring board 60 includes a first relay terminal 63P and a second relay terminal 64P. The first relay terminal 63P and the second relay terminal 64P are located between the first bonded terminal 61P and the second bonded terminal 62P in the first direction D1. The first relay terminal 63P and the second relay terminal 64P are located at the center of the first flexible wiring board 60 in the first direction D1, for example.

As an example, the first relay terminal 63P includes tooth terminals arranged in a comb-like shape at a predetermined pitch along the first direction D1. The first relay terminal 63P is electrically connected to the first bonded terminal 61P inside the first flexible wiring board 60. The first bonded terminal 61P and the first relay terminal 63P are arranged so as to face opposite directions through the through hole 66. Note that the first adhered terminal 61P faces the front side of the paper in FIG. Further, the first relay terminal 63P faces toward the back side of the page in FIG. 4 .

As an example, the second relay terminal 64P includes tooth terminals arranged in a comb-like shape at a predetermined pitch along the first direction D1. The second relay terminal 64P is electrically connected to the second bonded terminal 62P inside the first flexible wiring board 60. The second relay terminal 64P faces in the same direction as the second adhered terminal 62P (in FIG. 4, toward the back of the paper). Therefore, in the first flexible wiring board 60, the first bonded terminal 61P faces the opposite direction to the second bonded terminal 62P, the first relay terminal 63P, and the second relay terminal 64P.

The second flexible wiring board 70 includes a third relay terminal 71P and a fourth relay terminal 72P. The third relay terminal 71P and the fourth relay terminal 72P are located at a first end opposite to the second end where the first power terminal 73P and the second power terminal 74P are located in the second direction D2. . In a plane including the first direction D1 and the second direction D2, the relative position of the second relay terminal 64P with respect to the first relay terminal 63P is equal to the relative position of the fourth relay terminal 72P with respect to the third relay terminal 71P.

As an example, the third relay terminal 71P includes tooth terminals arranged in a comb-like shape at the same pitch as the first relay terminal 63P along the first direction D1. The third relay terminal 71P is electrically connected to the first power supply terminal 73P inside the first flexible wiring board 60. For example, the fourth relay terminal 72P includes tooth terminals arranged in a comb-teeth shape along the first direction D1 at the same pitch as the second relay terminal 64P. The fourth relay terminal 72P is electrically connected to the second power terminal 74P inside the first flexible wiring board 60. The second flexible wiring board 70 has a third relay terminal 71P, a fourth relay terminal 72P, a first power supply terminal 73P, and a second power supply terminal 74P all facing in the same direction (the front side in the paper in FIG. 4). do.

The third relay terminal 71P is electrically connected to the first relay terminal 63P while facing the first relay terminal 63P. The fourth relay terminal 72P is electrically connected to the second relay terminal 64P while facing the second relay terminal 64P. For the connection between the first relay terminal 63P and the third relay terminal 71P and the connection between the second relay terminal 64P and the fourth relay terminal 72P, for example, an anisotropic conductive film, an anisotropic conductive paste, isotropic An adhesive consisting of at least one member selected from the group consisting of isotropic conductive film and isotropic conductive paste is used. The first flexible wiring board 60 and the second flexible wiring board 70 connect the first relay terminal 63P and the third relay terminal 71P, and the connection between the second relay terminal 64P and the fourth relay terminal 72P. are connected together by.

The first bonded terminal 61P is electrically connected to the first power supply terminal 73P via the first relay terminal 63P and the third relay terminal 71P. Therefore, the external power supply 1A is electrically connected to the first transparent electrode sheet 20 via the first power supply terminal 73P, the third relay terminal 71P, the first relay terminal 63P, the first adhered terminal 61P, and the first electrode terminal 22P. connected to.

The second bonded terminal 62P is electrically connected to the second power supply terminal 74P via the second relay terminal 64P and the fourth relay terminal 72P. Therefore, the external power supply 1A is electrically connected to the second transparent electrode sheet 30 via the second power supply terminal 74P, the fourth relay terminal 72P, the second relay terminal 64P, the second adhered terminal 62P, and the second electrode terminal 32P. connected to.

[Imposition of flexible wiring board]
As shown in FIG. 5, when manufacturing the first flexible wiring board 60, a plurality of first laminated sheets 80 on which materials forming the first flexible wiring board 60 are laminated are arranged. 1 flexible wiring board 60 is mounted. For example, a plurality of first flexible wiring boards 60 are placed on the first laminated sheet 80 along the second direction D2.

As shown in FIG. 6, the first laminated sheet 80 has a double-sided structure including two outer film layers 81 and 82 and a double-sided conductor layer 83 disposed between the two outer film layers 81 and 82. have The double-sided conductor layer 83 includes, for example, two

conductive layers

84 and 85 having conductivity, and an inner film layer 86 disposed between the two

conductive layers

84 and 85. The two outer film layers 81 and 82 and the inner film layer 86 are insulating resin films, and are made of polyimide, for example. The two outer film layers 81 and 82 and the inner film layer 86 are examples of insulating layers. The two

conductor layers

84 and 85 are formed of copper foil, for example. Conductor layer 84 contacts outer film layer 81 . Conductive layer 85 contacts outer film layer 82 . The first flexible wiring board 60 having a double-sided structure is formed by laminating an outer film layer 81, a conductor layer 84, an inner film layer 86, a conductor layer 85, and an outer film layer 82 in this order. Ru. In the double-sided structure, a plurality of terminals provided on one flexible wiring board face opposite directions. In other words, in a flexible wiring board having a double-sided structure, a plurality of terminals included in one flexible wiring board can be arranged so as to face either of two opposite directions.

Further, in FIG. 6, the first bonded terminal 61P, the first relay terminal 63P, and the through hole 66 are schematically shown in one cross section. The first adhered terminal 61P is a portion where the conductor layer 84 is exposed when the outer film layer 81 is removed. The first relay terminal 63P is a portion where the conductor layer 85 is exposed when the outer film layer 82 is removed. The first bonded terminal 61P and the first relay terminal 63P face opposite directions. Two conductor layers 84 and 85 located between the first adhered terminal 61P and the first relay terminal 63P are electrically connected via the through hole 66. Note that the second adhered terminal 62P and the second relay terminal 64P are portions where the conductor layer 85 is exposed when the outer film layer 82 is removed. The second adhered terminal 62P and the second relay terminal 64P face the same direction as the first relay terminal 63P.

As shown in FIG. 7, when manufacturing the second flexible wiring board 70, a plurality of layers are included in the second laminated sheet 90 on which the materials forming the second flexible wiring board 70 are laminated. 2 flexible wiring board 70 is mounted. For example, the second laminated sheet 90 includes a plurality of second flexible wiring boards 70 lined up along the second direction D2, and adjacent second flexible wiring boards 70 arranged along the first direction D1. 70 are reversed 180 degrees and arranged alternately.

As shown in FIG. 8, the second laminated sheet 90 has a single-sided structure including two film layers 91 and 92 and a conductor layer 93 disposed between the two film layers 91 and 92. The two film layers 91 and 92 are each made of an insulating resin film, and are made of polyimide, for example. The two film layers 91 and 92 are an example of an insulating layer. The conductor layer 93 is formed of copper foil, for example. The second flexible wiring board 70 having a single-sided structure is formed by laminating a film layer 91, a conductor layer 93, and a film layer 92 in this order. The second flexible wiring board 70 having a single-sided structure has fewer layers in the stacking direction than the first flexible wiring board 60 having a double-sided structure. In the single-sided structure, a plurality of terminals included in one flexible wiring board face in one direction. In other words, in a flexible wiring board having a single-sided structure, a plurality of terminals included in one flexible wiring board are arranged so as to face the same direction.

Further, in FIG. 8, the third relay terminal 71P, the fourth relay terminal 72P, the first power terminal 73P, and the second power terminal 74P are schematically shown in one cross section. The third relay terminal 71P, the fourth relay terminal 72P, the first power supply terminal 73P, and the second power supply terminal 74P are portions where the conductor layer 93 is exposed when the film layer 91 is removed. The third relay terminal 71P, the fourth relay terminal 72P, the first power terminal 73P, and the second power terminal 74P face the same direction.

In the flexible wiring board unit 50, the first flexible wiring board 60 and the second flexible wiring board 70, which extend in different directions, are manufactured separately and then connected together. Thereby, the first flexible wiring board 60 can be efficiently laid out in the first laminated sheet 80 so as to increase the yield. Similarly, the second flexible wiring board 70 can be efficiently laid out in the second laminated sheet 90 so as to increase the yield. Therefore, the yield can be improved compared to the case where the first flexible wiring board 60 and the second flexible wiring board 70 are manufactured as one flexible wiring board.

By manufacturing the first flexible wiring board 60 and the second flexible wiring board 70 separately, the first flexible wiring board 60 has a double-sided structure, while the second flexible wiring board 70 has a double-sided structure. It becomes possible to have a single-sided structure. If the first flexible wiring board 60 and the second flexible wiring board 70 are manufactured as one flexible wiring board, the entire flexible wiring board has a first laminated sheet having a double-sided structure. Formed from 80. The second laminated sheet 90 having a single-sided structure is thinner than the first laminated sheet 80 having a double-sided structure because it has fewer layers, and thus has high flexibility and bending resistance. . Furthermore, since the number of constituent layers is small, the manufacturing cost is also low. Therefore, while the first flexible wiring board 60 has a double-sided structure, the second flexible wiring board 70 has a single-sided structure, which simplifies the layer structure of the second flexible wiring board 70 and increases its flexibility. can be increased. Furthermore, manufacturing costs can be reduced compared to the case where the entire flexible wiring board unit 50 has a double-sided structure.

The first relay terminal 63P and the second relay terminal 64P are arranged in the first flexible wiring board 60 so as to face the same direction. Similarly, the third relay terminal 71P and the fourth relay terminal 72P are arranged in the second flexible wiring board 70 so as to face the same direction. Therefore, the first relay terminal 63P and the third relay terminal 71P can be connected at the same time, and the second relay terminal 64P and the fourth relay terminal 72P can be connected at the same time. Thereby, the first flexible wiring board 60 and the second flexible wiring board 70 can be efficiently connected.

[Advantages of the first embodiment]
According to the first embodiment, the following advantages can be obtained.
(1-1) In the flexible wiring board unit 50, the first flexible wiring board 60 and the second flexible wiring board 70, which extend in different directions, are manufactured separately and then integrated into one. Connected. Therefore, each of the first flexible wiring board 60 and the second flexible wiring board 70 can be efficiently surfaced to increase the yield. Thereby, the yield can be improved compared to the case where the first flexible wiring board 60 and the second flexible wiring board 70 are manufactured as one flexible wiring board.

(1-2) The first flexible wiring board 60 has a double-sided structure, while the second flexible wiring board 70 has a single-sided structure. Thereby, the layer structure of the second flexible wiring board 70 can be simplified compared to the case where the entire flexible wiring board unit 50 has a double-sided structure. Thereby, the flexibility of the second flexible wiring board 70 can be increased. It also becomes possible to reduce manufacturing costs.

(1-3) The first relay terminal 63P and the second relay terminal 64P are arranged so as to face the same direction, and the third relay terminal 71P and the fourth relay terminal 72P are arranged so as to face the same direction. By arranging the first flexible wiring board 60 and the second flexible wiring board 70, it is possible to efficiently connect the first flexible wiring board 60 and the second flexible wiring board 70.

[Example of modification of the first embodiment]
Note that the first embodiment described above can be modified and implemented as follows. In addition, the modification examples shown below can be combined within a technically consistent range.

- The second flexible wiring board 70 is positioned relative to the first flexible wiring board 60 at a position offset from the center of the first flexible wiring board 60 in the first direction D1 to one end side. May be connected. That is, the first relay terminal 63P and the second relay terminal 64P may be located biased toward the first bonded terminal 61P or biased toward the second bonded terminal 62P in the first direction D1. may be located. For example, the first relay terminal 63P and the second relay terminal 64P may be located at one end of the first flexible wiring board 60 in the first direction D1. In this case, the second flexible wiring board 70 is connected to the first flexible wiring board 60 at one end of the first flexible wiring board 60 in the first direction D1. In this case, the degree of freedom of the wiring route from the light control sheet 10, which is an example of the power supply target, to the external power source 1A is increased. Furthermore, even in this case, advantages similar to the above (1-1) and (1-2) can be obtained. Note that the flexible wiring board unit 50 has a shape in which the first flexible wiring board 60 and the second flexible wiring board 70 are connected at the center of the first flexible wiring board 60 in the first direction D1. When these are manufactured as one flexible wiring board, the imposition efficiency becomes particularly poor. In such a case, by manufacturing the first flexible wiring board 60 and the second flexible wiring board 70 separately, the flexible wiring board unit 50 can be manufactured as one flexible wiring board. The effect of improving yield is greater when compared to the case where

- Although the case where the first direction D1 is perpendicular to the second direction D2 has been illustrated, the second direction D2 may be any direction as long as it intersects with the first direction D1. For example, the second flexible wiring board 70 may be connected diagonally to the first flexible wiring board 60. Even in this case, advantages similar to (1-1) and (1-2) above can be obtained. Note that, like the combination of the first flexible wiring board 60 and the second flexible wiring board 70, two flexible wiring board units 50 in which the extending directions of the two flexible wiring boards are orthogonal are combined into one flexible wiring board unit 50. When manufactured as a flexible wiring board, the imposition efficiency is particularly poor. In this regard, by separately manufacturing the first flexible wiring board 60 and the second flexible wiring board 70 whose extending directions are perpendicular to each other, the flexible wiring board unit 50 can be integrated into one flexible wiring board. The effect of improving the yield is greater when compared to the case of manufacturing as

- The second flexible wiring board 70 may have a double-sided structure. For example, the first power terminal 73P and the second power terminal 74P may face opposite directions. In this case, a through hole is provided between the third relay terminal 71P and the first power supply terminal 73P or between the fourth relay terminal 72P and the second power supply terminal 74P. In this case, the degree of freedom in connecting the first power terminal 73P and the second power terminal 74P to the external power source 1A is increased.

[Dimmer unit of second embodiment]
The light control unit of the second embodiment will be described below with reference to FIGS. 9 to 16.
As shown in FIG. 9, a light control unit 101 of the second embodiment includes a light control sheet 10 similar to that of the first embodiment and a flexible wiring board unit 150. The flexible wiring board unit 150 is connected to the edge 10E of the light control sheet 10.

The flexible wiring board unit 150 includes a first flexible wiring board 160 extending in the first direction D1 and a second flexible wiring board 170 extending in the second direction D2 intersecting the first direction D1. In other words, in the flexible wiring board unit 150, the first flexible wiring board 160 and the second flexible wiring board 170 are electrically connected so that the first direction D1 and the second direction D2 intersect. Connected. The first flexible wiring board 160 is responsible for electrical connection with the light control sheet 10, which is an example of a power supply target, in the flexible wiring board unit 150. The second flexible wiring board 170 is responsible for electrical connection with the external power supply 1A in the flexible wiring board unit 150.

The first flexible wiring board 160 and the second flexible wiring board 170 are each one flexible printed circuit board (FPC). The first flexible wiring board 160 includes a first bonded terminal 161 and a second bonded terminal 162. The first bonded terminal 161 and the second bonded terminal 162 are lined up along the first direction D1 in the first flexible wiring board 160. The first bonded terminal 161 is located at one end of the first flexible wiring board 160 in the first direction D1. The second adhered terminal 162 is located at the other end of the first flexible wiring board 160 in the first direction D1. In other words, the first bonded terminal 161 is located at the first end of the first flexible wiring board 160 in the first direction D1. The second adhered terminal 162 is located at a second end of the first flexible wiring board 160 opposite to the first end in the first direction D1.

The first bonded terminal 161 is located on the second space side (the back side of the paper in FIG. 9) with respect to the first electrode terminal 22P, and has a surface facing the first space (the front side of the paper in FIG. 9). do. The first bonded terminal 161 includes a plurality of first bonded tooth terminals 161P arranged in a comb-teeth shape at a predetermined pitch along the first direction D1. The first tooth terminal 161P to be bonded is bonded so as to be electrically connected to the first electrode terminal 22P while facing the first electrode terminal 22P.

The second adhered terminal 162 is located on the first space side (the front side of the paper in FIG. 9) with respect to the second electrode terminal 32P, and has a surface facing the second space (the back side of the paper in FIG. 9). do. The second bonded terminal 162 includes a plurality of second bonded tooth terminals 162P arranged in a comb-teeth shape at a predetermined pitch along the first direction D1. The second tooth terminal 162P to be bonded is bonded so as to be electrically connected to the second electrode terminal 32P while facing the second electrode terminal 32P.

The first flexible wiring board 160 includes a first relay terminal 163 and a second relay terminal 164. The first relay terminal 163 and the second relay terminal 164 are lined up in the first flexible wiring board 160 along the second direction D2 at a constant distance from each other. The first relay terminal 163 and the second relay terminal 164 face the first space side (the front side of the paper in FIG. 9).

The first bonded terminal 161 and the second bonded terminal 162 are located at one end of the first flexible wiring board 160 in the second direction D2. The second relay terminal 164 is located at the other end of the first flexible wiring board 160 opposite to the first bonded terminal 161 and the second bonded terminal 162 in the second direction D2. In other words, the first bonded terminal 161 and the second bonded terminal 162 are located at the first end of the first flexible wiring board 160 in the second direction D2. The second relay terminal 164 is located at an end of the first flexible wiring board 160 opposite to the first bonded terminal 161 and the second bonded terminal 162 in the second direction D2, that is, the first end. located at the opposite second end. The first relay terminal 163 is located between the first bonded terminal 161, the second bonded terminal 162, and the second relay terminal 164 in the second direction D2.

The first relay terminal 163 includes a plurality of first tooth terminals 163P arranged in a comb-teeth shape at a constant pitch along the first direction D1. As an example, in the first relay terminal 163, a plurality of first tooth terminals 163P are lined up from the position of the first to-be-bonded terminal 161 to the position of the second to-be-bonded terminal 162 in the first direction D1.

The second relay terminal 164 includes a plurality of second tooth terminals 164P arranged in a comb-teeth shape at a constant pitch along the first direction D1. In the second relay terminal 164, for example, a plurality of second tooth terminals 164P are lined up from the position of the first to-be-bonded terminal 161 to the position of the second to-be-bonded terminal 162 in the first direction D1.

The first end of the second flexible wiring board 170 in the second direction D2 is mechanically and electrically connected to the first flexible wiring board 160. The second flexible wiring board 170 extends from the connection portion with the first flexible wiring board 160 along the second direction D2 to the side opposite to the light control sheet 10. For example, the flexible wiring board unit 150 has a substantially T-shaped outer shape due to the first flexible wiring board 160 and the second flexible wiring board 170.

The second flexible wiring board 170 includes a third relay terminal 171 and a fourth relay terminal 172. The third relay terminal 171 and the fourth relay terminal 172 are located at the first end of the second flexible wiring board 170 in the second direction D2. The third relay terminal 171 and the fourth relay terminal 172 are connected along the first direction D1 with the fourth relay terminal 172 spaced apart from the third relay terminal 171 by a certain distance along the second direction D2. line up. The third relay terminal 171 and the fourth relay terminal 172 face the second space side (the back side of the paper in FIG. 9).

The third relay terminal 171 includes a plurality of third tooth terminals 171P arranged in a comb-teeth pattern at a constant pitch along the first direction D1. The fourth relay terminal 172 includes a plurality of fourth tooth terminals 172P arranged in a comb-teeth shape at a constant pitch along the first direction D1. The pitches at which the first tooth terminals 163P, the second tooth terminals 164P, the third tooth terminals 171P, and the fourth tooth terminals 172P are arranged are equal to each other.

As an example, the number of first tooth terminals 163P is equal to the number of second tooth terminals 164P. For example, the number of third tooth terminals 171P is equal to the number of fourth tooth terminals 172P. The number of first tooth terminals 163P is greater than the number of third tooth terminals 171P. The number of second tooth terminals 164P is greater than the number of fourth tooth terminals 172P.

Each third tooth terminal 171P is mechanically and electrically connected to any one of the plurality of first tooth terminals 163P. Similarly, each fourth tooth terminal 172P is mechanically and electrically connected to any one of the plurality of second tooth terminals 164P. This mechanically and electrically connects the first flexible wiring board 160 and the second flexible wiring board 170.

The second flexible wiring board 170 includes a first power terminal 173P and a second power terminal 174P. The first power terminal 173P and the second power terminal 174P are located at a second end opposite to the first end where the third relay terminal 171 and the fourth relay terminal 172 are located in the second direction D2. . The first power supply terminal 173P and the second power supply terminal 174P are each connected to the external power supply 1A. The external power supply 1A applies a voltage between the first transparent electrode sheet 20 and the second transparent electrode sheet 30 via the flexible wiring board unit 150. Thereby, the light control sheet 10 changes the light transmittance. The light control sheet 10 is an example of a power supply target to which the external power supply 1A supplies power via the flexible wiring board unit 150.

[Cross-sectional structure of the light control unit of the second embodiment]
As shown in FIGS. 10 and 11, the first flexible wiring board 160 includes a first outer insulating layer 160A, a second outer insulating layer 160B, an inner insulating layer 160C, a first conductor layer 160D, and a second conductor layer. 160E (see FIG. 11). The inner insulating layer 160C is located between the first outer insulating layer 160A and the second outer insulating layer 160B. The first outer insulating layer 160A is located on the side of the first space defined by the light control sheet 10 with respect to the inner insulating layer 160C. The second outer insulating layer 160B is located on the side of the second space defined by the light control sheet 10 with respect to the inner insulating layer 160C. The first outer insulating layer 160A, the second outer insulating layer 160B, and the inner insulating layer 160C are insulating resin films, and are made of polyimide, for example.

The first conductor layer 160D is located between the first outer insulating layer 160A and the inner insulating layer 160C. The second conductor layer 160E is located between the second outer insulating layer 160B and the inner insulating layer 160C. The first conductor layer 160D and the second conductor layer 160E are conductive metal films, and are made of copper foil, for example. Note that the second conductor layer 160E is not arranged in the cross section shown in FIG. Further, the first conductor layer 160D shown in FIG. 10 is electrically insulated from the first conductor layer 160D shown in FIG. 11. The first flexible wiring board 160 having a double-sided structure includes a first outer insulating layer 160A, a first conductor layer 160D, an inner insulating layer 160C, a second conductor layer 160E, and a second outer insulating layer 160B. They are formed by laminating in this order.

As shown in FIG. 10, the first bonded terminal 161 and the first relay terminal 163 are located at the portion of the first flexible wiring board 160 where the first conductor layer 160D is exposed from the first outer insulating layer 160A. be. The first adhered terminal 161 is electrically connected to the first relay terminal 163 inside the first flexible wiring board 160 via the first conductor layer 160D.

A first bonded terminal 161 is bonded to the first electrode terminal 22P via a first conductive adhesive 61A so as to be electrically connected thereto. A first sealing portion 61B for covering the end face of the light control layer 40 is provided on the first electrode terminal 22P.

As shown in FIG. 11, the second bonded terminal 162 is a portion of the first flexible wiring board 160 where the second conductor layer 160E is exposed from the second outer insulating layer 160B. The second relay terminal 164 is a portion of the first flexible wiring board 160 where the first conductor layer 160D is exposed from the first outer insulating layer 160A. The second conductor layer 160E forming the second adhered terminal 162 and the first conductor layer 160D forming the second relay terminal 164 are electrically connected via a through hole 165.

A second bonded terminal 162 of the first flexible wiring board 160 is bonded to the second electrode terminal 32P via a second conductive adhesive 62A so as to be electrically connected thereto. A second sealing portion 62B for covering the end face of the light control layer 40 is provided on the second electrode terminal 32P.

[First flexible wiring board of second embodiment]
As shown in FIG. 12, the length of the first relay terminal 163 is equal to the length of the second relay terminal 164 in the first direction D1. In the first direction D1, the second relay terminal 164 is disposed at a position shifted toward the second adhered terminal 162 by a distance L1 with respect to the first relay terminal 163. In the first direction D1, a plurality of through holes 165 are arranged between the end of the first flexible wiring board 160 on the second bonded terminal 162 side and the first relay terminal 163. In the second direction D2, the second relay terminal 164 is arranged at a constant distance L2 from the first relay terminal 163.

Next, the first tooth terminal 163P will be explained with reference to FIG. 13. Note that in FIG. 13, the first conductor layer 160D is shown with thin dots. Further, since the second tooth terminal 164P has the same configuration as the first tooth terminal 163P, a detailed explanation thereof will be omitted.

As shown in FIG. 13, the plurality of first tooth terminals 163P are arranged at a constant pitch P1 along the first direction D1. Each first tooth terminal 163P includes a first convex portion 166. The first convex portion 166 is an example of a reference portion for arranging the third tooth terminal 171P at an appropriate position with respect to the first tooth terminal 163P in each of the first direction D1 and the second direction D2. For example, the first convex portion 166 protrudes from the side edge of the first tooth terminal 163P from the first bonded terminal 161 side toward the second bonded terminal 162 side along the first direction D1. In the first direction D1, the length from the center of the portion of the first tooth terminal 163P extending in the second direction D2 to the tip of the first convex portion 166 is a distance L3. For example, the first convex portion 166 is located approximately at the center of the first tooth terminal 163P in the second direction D2.

[Second flexible wiring board of second embodiment]
Next, the second flexible wiring board 170 will be explained with reference to FIG. 14. Note that FIG. 14 shows the second flexible wiring board 170 in a state in which the front and back sides are reversed from the state shown in FIG.

As shown in FIG. 14, the second flexible wiring board 170 includes a third outer insulating layer 170A, a fourth outer insulating layer 170B, and a conductor layer 170C. The conductor layer 170C is located between the third outer insulating layer 170A and the fourth outer insulating layer 170B. The third outer insulating layer 170A is located on the first space side (the back side of the paper in FIG. 14) with respect to the conductor layer 170C. The fourth outer insulating layer 170B is located on the second space side (the front side of the paper in FIG. 14) with respect to the conductor layer 170C. The third outer insulating layer 170A and the fourth outer insulating layer 170B are insulating resin films, and are made of polyimide, for example. The conductor layer 170C is a metal film having conductivity, and is made of copper foil, for example. The second flexible wiring board 170 having a single-sided structure is formed by laminating a third outer insulating layer 170A, a conductor layer 170C, and a fourth outer insulating layer 170B in this order. The second flexible wiring board 170 having a single-sided structure has fewer layers in the stacking direction than the first flexible wiring board 160 having a double-sided structure.

The third relay terminal 171, the fourth relay terminal 172, the first power supply terminal 173P, and the second power supply terminal 174P included in the second flexible wiring board 170 are the portions where the conductor layer 170C is exposed from the fourth outer insulating layer 170B. It is. The conductor layer 170C electrically connects the third relay terminal 171 and the first power terminal 173P inside the second flexible wiring board 170, and also connects the fourth relay terminal 172 and the second power terminal 174P. Connect electrically. Note that in the conductor layer 170C, a portion connecting the third relay terminal 171 and the first power terminal 173P is electrically insulated from a portion connecting the fourth relay terminal 172 and the second power terminal 174P. ing.

In the first direction D1, the length of the third relay terminal 171 is equal to the length of the fourth relay terminal 172. In the first direction D1, the distance L4 from the end of the third relay terminal 171 that is far from the fourth relay terminal 172 to the end of the fourth relay terminal 172 that is close to the third relay terminal 171 is: Equal to distance L1. In the second direction D2, the fourth relay terminal 172 is arranged with a certain distance L5 from the third relay terminal 171. Distance L5 is equal to distance L2.

According to such an arrangement, when each third tooth terminal 171P is electrically connected to any one of the plurality of first tooth terminals 163P, each fourth tooth terminal 172P is connected to the plurality of second tooth terminals 164P. electrically connected to one of the following. In other words, the third relay terminal 171 connects the fourth tooth terminal 171 so that when each third tooth terminal 171P is connected to the first tooth terminal 163P, each fourth tooth terminal 172P is connected to the second tooth terminal 164P. It is arranged with respect to the relay terminal 172.

In the first flexible wiring board 160, the second bonded terminal 162 is connected to the first bonded terminal 161, the first relay terminal 163, and is arranged so as to face the opposite direction to the second relay terminal 164. On the other hand, in the second flexible wiring board 170, the third relay terminal 171, the fourth relay terminal 172, the first power supply terminal 173P, and the The two power supply terminals 174P are arranged so as to face the same direction. With such a configuration, even if the first tooth terminal 161P and the second tooth terminal 162P are required to face opposite directions, the layers of the second flexible wiring board 170 The configuration can be simplified. As a result, it becomes possible to improve the bending resistance and flexibility of the second flexible wiring board 170 due to the fewer layers.

Next, the third tooth terminal 171P will be explained with reference to FIG. 15. Note that in FIG. 15, the conductor layer 170C is shown with dark dots. Further, since the fourth tooth terminal 172P has the same configuration as the third tooth terminal 171P, a detailed explanation thereof will be omitted.

As shown in FIG. 15, the plurality of third tooth terminals 171P are lined up at a constant pitch P1 along the first direction D1. The third tooth terminals 171P located at each end in the first direction D1 among the plurality of third tooth terminals 171P each include two second convex portions 175. The second convex portion 175 is an example of a positioning portion for arranging the third tooth terminal 171P at an appropriate position with respect to the first tooth terminal 163P in each of the first direction D1 and the second direction D2.

As an example, the second convex portion 175 protrudes from the side edge of the third tooth terminal 171P from the third relay terminal 171 side toward the fourth relay terminal 172 side along the first direction D1. In the first direction D1, the length from the center of the portion of the third tooth terminal 171P extending in the second direction D2 to the tip of the second convex portion 175 is a distance L6. The distance L6 is, for example, larger than the distance L3. For example, the two second convex portions 175 are arranged with a gap greater than the width of the first convex portion 166 in the second direction D2.

[Connection between the first flexible wiring board and the second flexible wiring board of the second embodiment]
Each third tooth terminal 171P is electrically connected to any one of the plurality of first tooth terminals 163P in a facing state. At the same time, each fourth tooth terminal 172P is electrically connected to the second tooth terminal 164P while facing any one of the plurality of second tooth terminals 164P. The connection between the first tooth terminal 163P and the third tooth terminal 171P and the connection between the second tooth terminal 164P and the fourth tooth terminal 172P can be made using, for example, an anisotropic conductive film, an anisotropic conductive paste, an isotropic conductive paste, etc. An adhesive consisting of at least one selected from the group consisting of a conductive film and an isotropic conductive paste is used.

The first flexible wiring board 160 and the second flexible wiring board 170 connect the first tooth terminal 163P and the third tooth terminal 171P, and the connection between the second tooth terminal 164P and the fourth tooth terminal 172P. are connected together by. The first tooth terminal 163P and the second tooth terminal 164P face the same direction, and the third tooth terminal 171P and the fourth tooth terminal 172P face the same direction. Therefore, the connection between the first tooth terminal 163P and the third tooth terminal 171P and the connection between the second tooth terminal 164P and the fourth tooth terminal 172P can be performed at the same time.

The flexible wiring board unit 150 can change the arrangement of the third tooth terminal 171P with respect to the first tooth terminal 163P and the arrangement of the fourth tooth terminal 172P with respect to the second tooth terminal 164P for each pitch P1. That is, the flexible wiring board unit 150 can change the arrangement of the second flexible wiring board 170 with respect to the first flexible wiring board 160 at every pitch P1 in the first direction D1.

The first bonded terminal 161 is electrically connected to the external power supply 1A via the first relay terminal 163, the third relay terminal 171, and the first power supply terminal 173P. The second adhered terminal 162 is electrically connected to the external power supply 1A via the second relay terminal 164, the fourth relay terminal 172, and the second power supply terminal 174P.

Note that among the plurality of first tooth terminals 163P, the first tooth terminals 163P that are not connected to the third tooth terminals 171P are sealed by, for example, applying and curing an insulating resin paste. Similarly, of the plurality of second tooth terminals 164P, the second tooth terminals 164P that are not connected to the fourth tooth terminals 172P are sealed, for example, by applying and curing an insulating resin paste.

Next, with reference to FIG. 16, the connection portion between the first tooth terminal 163P and the third tooth terminal 171P will be described. Note that in FIG. 16, the first conductor layer 160D of the first flexible wiring board 160 is shown with thin dots, and the conductor layer 170C is shown with dark dots. Further, since the second tooth terminal 164P and the fourth tooth terminal 172P have the same configuration as the first tooth terminal 163P and the third tooth terminal 171P, detailed explanation thereof will be omitted.

Each third tooth terminal 171P is connected to any one of the plurality of first tooth terminals 163P in an overlapping state. In the second direction D2, the first protrusion 166 of the first tooth terminal 163P is located between the two second protrusions 175 of the third tooth terminal 171P located at each end of the first direction D1. . At the same time, in the first direction D1, the tips of the two second convex parts 175 are located between the adjacent first tooth terminals 163P, and are located between the first convex part 166 and the other closest to the first convex part 166. It is located between the side edge of the first tooth terminal 163P. In other words, the first convex portion 166 is located inside the recess formed by the side edge of the third tooth terminal 171P and the two second convex portions 175.

When the first protrusion 166 is arranged inside the recess formed by the side edge of the third tooth terminal 171P and the two second protrusions 175, in each of the first direction D1 and the second direction D2, The first tooth terminal 163P is properly placed on the third tooth terminal 171P. That is, in each of the first direction D1 and the second direction D2, based on the relative arrangement of the first convex portion 166 and the two second convex portions 175, the third tooth terminal is placed relative to the first tooth terminal 163P. 171P can be placed at an appropriate position.

Further, among the plurality of third tooth terminals 171P, positioning is performed using the first convex portion 166 and the second convex portion 175 in the third tooth terminals 171P located at each end in the first direction D1. Thereby, each third tooth terminal 171P included in the third relay terminal 171 can be placed at an appropriate position with respect to the first tooth terminal 163P to which each third tooth terminal 171P is connected. Further, the first convex portion 166 is provided on each of the first tooth terminals 163P. Therefore, no matter which first tooth terminal 163P the third tooth terminal 171P having the two second convex portions 175 is connected to, the two second convex portions 175 are properly connected to the first convex portion 166. By arranging the third tooth terminal 171P at the appropriate position, the third tooth terminal 171P can be placed at an appropriate position with respect to the first tooth terminal 163P.

[Advantages of second embodiment]
According to the second embodiment, in addition to the advantage (1-1) above, the following advantages can be obtained.

(2-1) In the flexible wiring board unit 150, the arrangement of the second flexible wiring board 170 with respect to the first flexible wiring board 160 can be changed at every pitch P1 in the first direction D1. For example, in the flexible wiring board 330 shown in FIG. 30, the position where the second portion 332 is pulled out from the first portion 331 is determined depending on the wiring route from the light control sheet 300 to the external power source 340. If the positions at which the second portion 332 is pulled out from the first portion 331 are different, even if the first portion 331 and the second portion 332 have the same shape, the entire flexible wiring board 330 may be replaced with a new flexible wiring board having a different shape. It is necessary to manufacture it as a flexible wiring board. In this regard, in the flexible wiring board unit 150 of the second embodiment, multiple types of wiring routes can be realized by changing the arrangement of the second flexible wiring board 170 with respect to the first flexible wiring board 160. can.

(2-2) The first relay terminal 163 and the second relay terminal 164 in the first flexible wiring board 160 face the same direction, and the third relay terminal in the second flexible wiring board 170 faces the same direction. Relay terminal 171 and fourth relay terminal 172 face the same direction. Thereby, the connection between the first relay terminal 163 and the third relay terminal 171 and the connection between the second relay terminal 164 and the fourth relay terminal 172 can be performed at the same time. Therefore, the first flexible wiring board 160 and the second flexible wiring board 170 can be efficiently connected.

(2-3) In the first flexible wiring board 160, the second bonded terminal 162 faces in the opposite direction to the first bonded terminal 161, the first relay terminal 163, and the second relay terminal 164. Further, in the second flexible wiring board 170, the third relay terminal 171, the fourth relay terminal 172, the first power terminal 173P, and the second power terminal 174P face the same direction. With such a configuration, the layer structure of the second flexible wiring board 170 can be simplified even if the first bonded terminal 161 and the second bonded terminal 162 are required to face in opposite directions. be able to. As a result, it becomes possible to improve the bending resistance and flexibility of the second flexible wiring board 170.

(2-4) By providing the first convex portion 166 on each first tooth terminal 163P, it is possible to connect the third tooth terminal 171P provided with the second convex portion 175 to which first tooth terminal 163P. However, the third tooth terminal 171P can be placed at an appropriate position with respect to the first tooth terminal 163P. Similarly, by providing the first convex portion 166 on each second tooth terminal 164P, no matter which second tooth terminal 164P the fourth tooth terminal 172P having the second convex portion 175 is connected to. , the fourth tooth terminal 172P can be placed at an appropriate position with respect to the second tooth terminal 164P.

[Example of modification of second embodiment]
Note that the second embodiment described above can be modified and implemented as follows. In addition, the modification examples shown below can be combined within a technically consistent range.

- The reference portion provided by each first tooth terminal 163P and each second tooth terminal 164P is not limited to the first convex portion 166. Similarly, a third tooth terminal 171P located at each end in the first direction D1 among the plurality of third tooth terminals 171P and a fourth tooth located at each end in the first direction D1 among the plurality of fourth tooth terminals 172P. The positioning portion included in the terminal 172P is not limited to the two second convex portions 175. The reference portion and the positioning portion properly align the third tooth terminal 171P with respect to the first tooth terminal 163P, or the fourth tooth terminal 172P with respect to the second tooth terminal 164P, based on the arrangement of the positioning portion with respect to the reference portion. Any shape is acceptable as long as it can be placed in a suitable position.

- For example, if high precision is not required for the arrangement of the third tooth terminal 171P with respect to the first tooth terminal 163P, while providing the first convex portion 166 on each first tooth terminal 163P, each second tooth terminal 164P The first convex portion 166 may not be provided. In this case, it is sufficient to provide the second protrusion 175 only on the third tooth terminal 171P, and it is not necessary to provide the second protrusion 175 on the fourth tooth terminal 172P. Similarly, if high precision is not required for the arrangement of the fourth tooth terminal 172P with respect to the second tooth terminal 164P, each second tooth terminal 164P is provided with a first convex portion 166, while each first tooth terminal 163P is provided with a first protrusion 166. The first convex portion 166 may not be provided. In this case, it is sufficient to provide the second protrusion 175 only on the fourth tooth terminal 172P, and it is not necessary to provide the second protrusion 175 on the third tooth terminal 171P. Further, the first convex portion 166 is not provided on either the first tooth terminal 163P or the second tooth terminal 164P, and the second convex portion 175 is not provided on either the third tooth terminal 171P or the fourth tooth terminal 172P. It is not necessary to provide

For example, in the second flexible wiring board 170, the first power terminal 173P and the second power terminal 174P may face opposite directions. In this case, a through hole is provided between the third relay terminal 171 and the first power terminal 173P or between the fourth relay terminal 172 and the second power terminal 174P. In this case, the degree of freedom in connecting the first power terminal 173P and the second power terminal 174P to the external power source 1A is increased.

- In the first flexible wiring board 160, the first relay terminal 163 and the second relay terminal 164 may face opposite directions. For example, the first relay terminal 163 faces the same direction as the first bonded terminal 161, the second relay terminal 164 faces the same direction as the second bonded terminal 162, and the first bonded terminal 161 and the 1 relay terminal 163 may face in the opposite direction. In this case, the first adhered terminal 161 and the first relay terminal 163 are electrically connected by the first conductor layer 160D. Further, the second adhered terminal 162 and the second relay terminal 164 are electrically connected by the second conductor layer 160E. Note that the through hole 165 may not be provided. In this case, the first relay terminals 163 and the second relay terminals 164 can be arranged in the stacking direction in which the layers forming the first flexible wiring board 160 are arranged. Therefore, the distance by which the first flexible wiring board 160 protrudes from the light control sheet 10 in the second direction D2 can be reduced. In addition, the second flexible wiring board 170 in this case has the third relay terminal 171 and the fourth relay terminal 172 arranged so that the third relay terminal 171 and the fourth relay terminal 172 face opposite directions. is placed. In this case, the connection between the first relay terminal 163 and the third relay terminal 171 and the connection between the second relay terminal 164 and the fourth relay terminal 172 are performed separately. Note that in the second flexible wiring board 170, the first power terminal 173P and the second power terminal 174P may face opposite directions or may face the same direction.

- For example, among the plurality of first tooth terminals 163P, the first tooth terminal 163P that is not connected to the third tooth terminal 171P has the first outer insulating layer 160A located on the outer surface side not removed. 160A. In other words, among the plurality of first tooth terminals 163P, at least the first tooth terminal 163P connected to the third tooth terminal 171P should be exposed from the first outer insulating layer 160A. By covering the first tooth terminal 163P that is not connected to the third tooth terminal 171P with the first outer insulating layer 160A, the work of sealing the first tooth terminal 163P that is not connected to the third tooth terminal 171P can be simplified. Note that similar changes can be made to the second tooth terminals 164P that are not connected to the fourth tooth terminals 172P among the plurality of second tooth terminals 164P.

[Dimmer unit of third embodiment]
The light control unit of the third embodiment will be described below with reference to FIGS. 17 to 21.
As shown in FIG. 17, a light control unit 201 of the third embodiment includes a light control sheet 10 similar to that of the first embodiment and a flexible wiring board unit 250. The flexible wiring board unit 250 is connected to the edge 10E of the light control sheet 10.

The flexible wiring board unit 250 includes a first flexible wiring board 260 extending in the first direction D1 and a second flexible wiring board 270 extending in the second direction D2 intersecting the first direction D1. In other words, in the flexible wiring board unit 250, the first flexible wiring board 260 and the second flexible wiring board 270 are electrically connected so that the first direction D1 and the second direction D2 intersect. Connected. The first flexible wiring board 260 is responsible for electrical connection with the light control sheet 10, which is an example of a power supply target, in the flexible wiring board unit 250. The second flexible wiring board 270 is responsible for electrical connection with the external power supply 1A in the flexible wiring board unit 250.

The first flexible wiring board 260 and the second flexible wiring board 270 are each one flexible printed circuit board (FPC). The first flexible wiring board 260 includes a first bonded terminal 261P and a second bonded terminal 262P. The first bonded terminals 261P and the second bonded terminals 262P are lined up along the first direction D1 in the first flexible wiring board 260. The first adhered terminal 261P is located at one end of the first flexible wiring board 260 in the first direction D1. The second adhered terminal 262P is located at the other end of the first flexible wiring board 260 in the first direction D1. In other words, the first bonded terminal 261P is located at the first end of the first flexible wiring board 260 in the first direction D1. The second adhered terminal 262P is located at a second end of the first flexible wiring board 260 opposite to the first end in the first direction D1.

The first bonded terminal 261P is located on the second space side (the back side of the paper in FIG. 17) with respect to the first electrode terminal 22P, and has a surface facing the first space (the front side of the paper in FIG. 17). do. The first bonded terminal 261P includes, for example, a plurality of tooth terminals arranged in a comb-teeth shape at a predetermined pitch along the first direction D1. The first bonded terminal 261P faces the first electrode terminal 22P and is bonded so as to be electrically connected to the first electrode terminal 22P.

The second bonded terminal 262P is located on the first space side (the front side of the page in FIG. 17) with respect to the second electrode terminal 32P, and has a surface facing the second space side (the back side of the page in FIG. 17). do. The second bonded terminal 262P includes, for example, a plurality of tooth terminals arranged in a comb-teeth shape at a predetermined pitch along the first direction D1. The second bonded terminal 262P is bonded so as to be electrically connected to the second electrode terminal 32P while facing the second electrode terminal 32P.

The first flexible wiring board 260 includes a plurality of first relay terminals 263P and a plurality of second relay terminals 264P. In the plurality of first relay terminals 263P and the plurality of second relay terminals 264P, the first relay terminals 263P and the second relay terminals 264P are arranged alternately in a line along the first direction D1. The first relay terminal 263P and the second relay terminal 264P face the first space side (the front side of the paper in FIG. 17).

Each of the first relay terminals 263P and each of the second relay terminals 264P includes a plurality of tooth terminals arranged in a comb shape at a constant pitch along the first direction D1. Each first relay terminal 263P and each second relay terminal 264P have the same number of tooth terminals lined up at the same pitch. Note that, as an example, the number of first relay terminals 263P is the same as the number of second relay terminals 264P, but the number may be greater than the number of second relay terminals 264P, or may be less than the number of second relay terminals 264P.

Each first relay terminal 263P is electrically connected to a first bonded terminal 261P inside the first flexible wiring board 260. Each second relay terminal 264P is electrically connected to the second bonded terminal 262P via a plurality of through holes 265 inside the first flexible wiring board 60.

The first end of the second flexible wiring board 270 in the second direction D2 is mechanically and electrically connected to the first flexible wiring board 260. The second flexible wiring board 270 extends from the connection portion with the first flexible wiring board 260 along the second direction D2 to the side opposite to the light control sheet 10. For example, the flexible wiring board unit 250 has a substantially T-shaped outer shape due to the first flexible wiring board 260 and the second flexible wiring board 270.

The second flexible wiring board 270 includes a third relay terminal 271P and a fourth relay terminal 272P. The third relay terminal 271P and the fourth relay terminal 272P are located at the first end of the second flexible wiring board 270 in the second direction D2. The third relay terminal 271P and the fourth relay terminal 272P are lined up along the first direction D1. The third relay terminal 271P and the fourth relay terminal 272P face the second space side (the back side of the paper in FIG. 17).

The third relay terminal 271P and the fourth relay terminal 272P include a plurality of tooth terminals arranged in a comb-like shape at a constant pitch along the first direction D1. The third relay terminal 271P and the fourth relay terminal 272P each have the same number of tooth terminals, and the pitch at which the tooth terminals are arranged is also the same. Further, the third relay terminal 271P and the fourth relay terminal 272P have the same number of tooth terminals as the tooth terminals provided in each of the first relay terminals 263P and each second relay terminal 264P, and the pitches at which the tooth terminals are arranged are also equal.

The third relay terminal 271P is connected to one of the adjacent first relay terminal 263P and second relay terminal 264P among the plurality of first relay terminals 263P and the plurality of second relay terminals 264P arranged in a row. The fourth relay terminal 272P is connected to the other of the adjacent first relay terminal 263P and second relay terminal 264P among the plurality of first relay terminals 263P and the plurality of second relay terminals 264P arranged in a row. Thereby, the first flexible wiring board 260 and the second flexible wiring board 270 are mechanically and electrically connected.

The second flexible wiring board 270 includes a first power terminal 273P and a second power terminal 274P. The first power terminal 273P and the second power terminal 274P are located at a second end opposite to the first end where the third relay terminal 271P and the fourth relay terminal 272P are located in the second direction D2. . The first power supply terminal 273P and the second power supply terminal 274P are each connected to the external power supply 1A. The external power supply 1A applies a voltage between the first transparent electrode sheet 20 and the second transparent electrode sheet 30 via the flexible wiring board unit 250. Thereby, the light control sheet 10 changes the light transmittance. The light control sheet 10 is an example of a power supply target to which the external power supply 1A supplies power via the flexible wiring board unit 250.

[Cross-sectional structure of the light control unit of the third embodiment]
As shown in FIGS. 18 and 19, the first flexible wiring board 260 includes a first outer insulating layer 260A, a second outer insulating layer 260B, an inner insulating layer 260C, a first conductor layer 260D, and a second conductor layer. 260E (see FIG. 19). The inner insulating layer 260C is located between the first outer insulating layer 260A and the second outer insulating layer 260B. The first outer insulating layer 260A is located on the side of the first space defined by the light control sheet 10 with respect to the inner insulating layer 260C. The second outer insulating layer 260B is located on the side of the second space defined by the light control sheet 10 with respect to the inner insulating layer 260C. The first outer insulating layer 260A, the second outer insulating layer 260B, and the inner insulating layer 260C are insulating resin films, and are made of polyimide, for example.

The first conductor layer 260D is located between the first outer insulating layer 260A and the inner insulating layer 260C. The second conductor layer 260E is located between the second outer insulating layer 260B and the inner insulating layer 260C. The first conductor layer 260D and the second conductor layer 260E are conductive metal films, and are made of copper foil, for example. Note that the second conductor layer 260E is not arranged in the cross section shown in FIG. Further, the first conductor layer 260D shown in FIG. 18 is electrically insulated from the first conductor layer 260D shown in FIG. 19. The first flexible wiring board 260 having a double-sided structure includes a first outer insulating layer 260A, a first conductor layer 260D, an inner insulating layer 260C, a second conductor layer 260E, and a second outer insulating layer 260B. They are formed by being laminated in this order.

As shown in FIG. 18, the first bonded terminal 261P and the first relay terminal 263P are located in the portion of the first flexible wiring board 260 where the first conductor layer 260D is exposed from the first outer insulating layer 260A. be. The first adhered terminal 261P is electrically connected to the first relay terminal 263P via the first conductor layer 260D inside the first flexible wiring board 260.

A first bonded terminal 261P is electrically bonded to the first electrode terminal 22P via a first conductive adhesive 61A. A first sealing portion 61B for covering the end face of the light control layer 40 is provided on the first electrode terminal 22P.

As shown in FIG. 19, the second bonded terminal 262P is a portion of the first flexible wiring board 260 where the second conductor layer 260E is exposed from the second outer insulating layer 260B. The second relay terminal 264P is a portion of the first flexible wiring board 260 where the first conductor layer 260D is exposed from the first outer insulating layer 260A. The second conductor layer 260E forming the second adhered terminal 262P and the first conductor layer 260D forming the second relay terminal 264P are electrically connected via the through hole 265.

A second bonded terminal 262P of the first flexible wiring board 260 is electrically bonded to the second electrode terminal 32P via a second conductive adhesive 62A. A second sealing portion 62B for covering the end face of the light control layer 40 is provided on the second electrode terminal 32P.

[First flexible wiring board of third embodiment]
As shown in FIG. 20, the first conductor layer 260D includes a first portion 260D1 and a second portion 260D2. The first portion 260D1 forms the first bonded terminal 261P and the first relay terminal 263P in the first conductor layer 260D, and connects the first bonded terminal 261P and each first relay terminal 263P. In the first portion 260D1, the first bonded terminal 261P is located at one end in the second direction D2, and each first relay terminal 263P is located at the other end in the second direction D2. The first conductor layer 260D extends in the second direction D2 from the first adhered terminal 261P toward each first relay terminal 263P.

The second portion 260D2 forms the second adhered terminal 262P of the first conductor layer 260D. One end of the second portion 260D2 overlaps with the second conductor layer 260E via the inner insulating layer 260C and is connected to the second conductor layer 260E via a plurality of through holes 265. The plurality of through holes 265 are located at the end of the first flexible wiring board 260 on the second bonded terminal 262P side in the first direction D1. The plurality of through holes 265 are located between the second bonded terminal 262P and each second relay terminal 264P in the second direction D2. Note that the number of through holes 265 may be determined according to the magnitude of the current flowing through the second portion 260D2 and the second conductor layer 260E, and for example, it may be one, or may be two or more. Good too.

The second portion 260D2 and the second conductor layer 260E overlap with each other with the inner insulating layer 260C interposed therebetween, and in the portion where the plurality of through holes 265 are provided, the first conductor layer 260D and the second conductor layer 260E are electrically This is an example of an interlayer connection portion 265A that is connected to each other. For example, the interlayer connection portion 265A is located between the second bonded terminal 262P and each second relay terminal 264P in the second direction D2. The interlayer connection portion 265A is located offset from the center of the first flexible wiring board 260 toward the second bonded terminal 262P in the first direction D1. Further, in the first direction D1, the width of the interlayer connection portion 265A is narrower than the width of the second bonded terminal 262P.

Since the interlayer connection portion 265A is a portion including the through hole 265, it is a portion that is relatively inflexible and has low bending resistance compared to other portions of the first flexible wiring board 260. In a plan view from a viewpoint facing the first flexible wiring board 260, the flexibility of the first flexible wiring board 260 as a whole can be increased by reducing the area of the interlayer connection part 265A as in the first embodiment. And it is possible to suppress a decrease in bending resistance. In other words, when viewed in plan from a viewpoint facing the first flexible wiring board 260, by arranging the plurality of through holes 265 in one place in a narrow area, the first flexible wiring board It is possible to suppress a decrease in flexibility and bending resistance of the 260 as a whole. In particular, in the first direction D1, the width of the interlayer connection portion 265A is made smaller than the width of the second bonded terminal 262P, and the interlayer connection portion 265A is biased toward the second bonded terminal 262P. Therefore, it is possible to suppress a decrease in bending resistance against bending in the direction along the first direction D1.

The second portion 260D2 extends from the interlayer connection portion 265A toward the end of the first flexible wiring board 260 opposite to the second bonded terminal 262P along the second direction D2. The second portion 260D2 extends between the side edge of the first flexible wiring board 260 on the second bonded terminal 262P side extending along the second direction D2 and the second relay terminal 264P closest to the side edge. pass. The second portion 260D2 is arranged in the first direction D1 between the side edge of the first flexible wiring board 260 opposite to the second adhered terminal 262P extending along the first direction D1 and each second relay terminal 264P. and extends toward the second bonded terminal 262P to form each second relay terminal 264P.

The plurality of first relay terminals 263P and the plurality of second relay terminals 64P are arranged alternately at a constant pitch P2 along the first direction D1. The first flexible wiring board 260 has a width W5 along the second direction D2. In the first relay terminal 263P, the tip of the comb-like tooth terminal extends toward the opposite side from the first bonded terminal 261P. In the second relay terminal 264P, the tip of the comb-like tooth terminal extends toward the second bonded terminal 262P.

Each first relay terminal 263P and each second relay terminal 264P includes a reference portion 266. As an example, one reference portion 266 is provided at both ends of each first relay terminal 263P and each second relay terminal 264P in the first direction D1. The reference portion 266 is, for example, a cross-shaped convex portion. The reference portion 266 serves as a reference for appropriately arranging the terminals when connecting the third relay terminal 271P or the fourth relay terminal 272P to the first relay terminal 263P or the second relay terminal 264P.

[Second flexible wiring board of third embodiment]
Next, the second flexible wiring board 270 will be explained with reference to FIG. 21. Note that FIG. 21 shows the second flexible wiring board 270 in a state in which the front and back sides are reversed from the state shown in FIG.

As shown in FIG. 21, the second flexible wiring board 270 includes a third outer insulating layer 270A, a fourth outer insulating layer 270B, and a conductor layer 270C. The conductor layer 270C is located between the third outer insulating layer 270A and the fourth outer insulating layer 270B. The third outer insulating layer 270A is located on the first space side (the back side of the paper in FIG. 21) with respect to the conductor layer 270C. The fourth outer insulating layer 270B is located on the second space side (the front side of the paper in FIG. 21) with respect to the conductor layer 270C. The third outer insulating layer 270A and the fourth outer insulating layer 270B are insulating resin films, and are made of polyimide, for example. The conductor layer 270C is a conductive metal film, and is made of copper foil, for example. The second flexible wiring board 270 having a single-sided structure is formed by laminating a third outer insulating layer 270A, a conductor layer 270C, and a fourth outer insulating layer 270B in this order. The second flexible wiring board 270 having a single-sided structure has fewer layers in the stacking direction than the first flexible wiring board 260 having a double-sided structure.

The third relay terminal 271P, the fourth relay terminal 272P, the first power supply terminal 273P, and the second power supply terminal 274P that the second flexible wiring board 270 includes are connected to a conductor layer in the second flexible wiring board 270. 270C is a portion exposed from the fourth outer insulating layer 270B. The conductor layer 270C electrically connects the third relay terminal 271P and the first power terminal 273P inside the second flexible wiring board 270, and also connects the fourth relay terminal 272P and the second power terminal 274P. Connect electrically. Note that in the conductor layer 270C, a portion connecting the third relay terminal 271P and the first power terminal 273P is electrically insulated from a portion connecting the fourth relay terminal 272P and the second power terminal 274P. ing. Further, in the first direction D1, the pitch P3 from the center of the third relay terminal 271P to the center of the fourth relay terminal 272P is, for example, the same as the pitch P2 where the first relay terminal 263P and the second relay terminal 264P are lined up. It is.

The third relay terminal 271P and the fourth relay terminal 272P each include a positioning portion 275. As an example, one positioning section 275 is provided at both ends of each of the third relay terminal 271P and the fourth relay terminal 272P in the first direction D1. The positioning portion 275 is, for example, a cross-shaped recess.

When connecting the third relay terminal 271P or the fourth relay terminal 272P to the first relay terminal 263P or the second relay terminal 264P, by combining the reference part 266 and the positioning part 275, the terminals can be properly connected to each other. can be placed. For example, when the third relay terminal 271P is connected to the first relay terminal 263P, when the convex shape of the reference part 266 is arranged inside the concave shape of the positioning part 275, the third relay terminal 271P is connected to the first relay terminal 263P. The third relay terminal 271P is appropriately arranged. That is, in a plane including the first direction D1 and the second direction D2, based on the arrangement of the positioning part 275 with respect to the reference part 266, the third relay terminal 271P and the fourth relay terminal 272P are connected to the first relay terminal 263P or It can be appropriately arranged with respect to the second relay terminal 264P.

The first flexible wiring board 260 has three insulating layers 260A to 260C and two

conductive layers

260D and 260E, so that a second bonded terminal 262P, a first bonded terminal 261P, a first relay terminal 263P, and is arranged so as to face the opposite direction to the second relay terminal 264P. On the other hand, the second flexible wiring board 270 has two insulating

layers

270A, 270B and one conductor layer 270C, so that the third relay terminal 271P, the fourth relay terminal 272P, the first power supply terminal 273P, and the The two power supply terminals 274P are arranged so as to face the same direction. Even if the first bonded terminal 261P and the second bonded terminal 262P are required to face opposite directions, the layer structure of the second flexible wiring board 270 can be simplified. As a result, it becomes possible to increase the bending resistance and flexibility of the second flexible wiring board 270 due to the smaller number of constituent layers.

[Connection between the first flexible wiring board and the second flexible wiring board of the third embodiment]
The third relay terminal 271P is one of the first relay terminal 263P and the second relay terminal 264P, and is connected to any one of the plurality of first relay terminals 263P and the plurality of second relay terminals 264P. be done. The fourth relay terminal 272P is the other of the first relay terminal 263P and the second relay terminal 264P, and the third relay terminal 271P is the other of the plurality of first relay terminals 263P and the plurality of second relay terminals 264P. It is connected to the relay terminal located next to the connected relay terminal.

For example, when the third relay terminal 271P is connected to the first relay terminal 263P, the fourth relay terminal 272P is connected to the second relay terminal 264P located next to the first relay terminal 263P to which the third relay terminal 271P is connected. connected to. For example, when the third relay terminal 271P is connected to the second relay terminal 264P, the fourth relay terminal 272P is connected to the first relay terminal 263P located next to the second relay terminal 264P to which the third relay terminal 271P is connected. connected to.

That is, when the third relay terminal 271P is electrically connected to one of the first relay terminal 263P and the second relay terminal 264P, the fourth relay terminal 272P is connected to the first relay terminal 263P and the second relay terminal 264P. electrically connected to the other one. In the second flexible wiring board 270, the fourth relay terminal is connected to the third relay terminal 271P in a plane including the first direction D1 and the second direction D2 so that the above connection is possible. 272P is placed.

The flexible wiring board unit 250 can change the arrangement of the third relay terminal 271P and the fourth relay terminal 272P with respect to the terminal row formed by the plurality of first relay terminals 263P and the plurality of second relay terminals 264P. . Thereby, the flexible wiring board unit 250 can change the arrangement of the second flexible wiring board 270 with respect to the first flexible wiring board 260 at every pitch P2 in the first direction D1.

The connection between the first relay terminal 263P and the second relay terminal 264P and the third relay terminal 271P and the fourth relay terminal 272P can be made using, for example, an anisotropic conductive film, an anisotropic conductive paste, an isotropic conductive film, or An adhesive consisting of at least one selected from the group consisting of isotropic conductive pastes is used.

The first flexible wiring board 260 and the second flexible wiring board 270 are connected to any one of the plurality of first relay terminals 263P and the plurality of second relay terminals 264P, and the third relay terminal 271P and the fourth relay terminal 272P. It is constructed integrally by connecting. The first relay terminal 263P and the second relay terminal 264P face the same direction, and the third relay terminal 271P and the fourth relay terminal 272P face the same direction. Therefore, one of the first relay terminal 263P and the second relay terminal 264P and the third relay terminal 271P are connected, and the other of the first relay terminal 263P and the second relay terminal 264P and the fourth relay terminal 272P are connected. connection can be made at once.

Note that the first relay terminal 263P and the second relay terminal 264P, which are not connected to either the third relay terminal 271P or the fourth relay terminal 272P, are sealed by, for example, applying and curing an insulating resin paste. be done.

Next, the circuit configuration of the flexible wiring board unit 250 will be explained. First, a case will be described in which the third relay terminal 271P is connected to the first relay terminal 263P, and the fourth relay terminal 272P is connected to the second relay terminal 264P. In this case, the first adhered terminal 261P is electrically connected to the external power supply 1A via the first relay terminal 263P, the third relay terminal 271P, and the first power supply terminal 273P. The second bonded terminal 262P is electrically connected to the external power source 1A via a second relay terminal 264P, a fourth relay terminal 272P, and a second power supply terminal 274P.

Next, a case will be described in which the third relay terminal 271P is connected to the second relay terminal 264P, and the fourth relay terminal 272P is connected to the first relay terminal 263P. In this case, the first adhered terminal 261P is electrically connected to the external power supply 1A via the first relay terminal 263P, the fourth relay terminal 272P, and the second power supply terminal 274P. The second adhered terminal 262P is electrically connected to the external power supply 1A via the second relay terminal 264P, the third relay terminal 271P, and the first power supply terminal 273P.

[Advantages of third embodiment]
According to the third embodiment, in addition to the advantage (1-1) above, the following advantages can be obtained.

(3-1) In the flexible wiring board unit 250, the arrangement of the second flexible wiring board 270 with respect to the first flexible wiring board 260 can be changed every pitch P2 in the first direction D1. For example, in the flexible wiring board 330 shown in FIG. 30, the position where the second portion 332 is pulled out from the first portion 331 is determined depending on the wiring route from the light control sheet 300 to the external power source 340. If the positions at which the second portion 332 is pulled out from the first portion 331 are different, even if the first portion 331 and the second portion 332 have the same shape, the entire flexible wiring board 330 may be replaced with a new flexible wiring board having a different shape. It is necessary to manufacture it as a flexible wiring board. In this regard, with the flexible wiring board unit 250 of the third embodiment, multiple types of wiring routes can be realized by changing the arrangement of the second flexible wiring board 270 with respect to the first flexible wiring board 260. can.

(3-2) In the first flexible wiring board 260, the first relay terminal 263P and the second relay terminal 264P face the same direction, and in the second flexible wiring board 270, the third The relay terminal 271P and the fourth relay terminal 272P face the same direction. Thereby, the connection between one of the first relay terminal 263P and the second relay terminal 264P and the third relay terminal 271P, and the connection between the other of the first relay terminal 263P and the second relay terminal 264P and the fourth relay terminal 272P can be connected at once. Therefore, the first flexible wiring board 260 and the second flexible wiring board 270 can be efficiently connected.

(3-3) In the first flexible wiring board 260, the second bonded terminal 262P faces the opposite direction to the first bonded terminal 261P, the first relay terminal 263P, and the second relay terminal 264P. Further, in the second flexible wiring board 270, the third relay terminal 271P, the fourth relay terminal 272P, the first power terminal 273P, and the second power terminal 274P face the same direction. Thereby, even if the first bonded terminal 261P and the second bonded terminal 262P are required to face opposite directions, the layer structure of the second flexible wiring board 270 can be simplified. As a result, it is also possible to improve the bending resistance and flexibility of the second flexible wiring board 270.

(3-4) In the first direction D1, the width of the interlayer connection portion 265A is made smaller than the width of the second bonded terminal 262P, and the interlayer connection portion 265A is made smaller than the center of the first flexible wiring board 260. It is biased toward the second bonded terminal 262P. Thereby, it is possible to suppress a decrease in the bending resistance of the first flexible wiring board 260 against bending in the direction along the first direction D1.

(3-5) A reference portion 266 is provided at each first relay terminal 263P and each second relay terminal 264P. As a result, regardless of which first relay terminal 263P or second relay terminal 264P each of the third relay terminal 271P and the fourth relay terminal 272P is connected to, the positioning portion 275 is arranged with respect to the reference portion 266. Based on this, two relay terminals to be connected can be appropriately arranged.

[Fourth embodiment]
Next, a light control unit of a fourth embodiment will be described with reference to FIG. 22. Note that the light control unit of the fourth embodiment is similar to the light control unit 201 of the third embodiment, except that it includes a first flexible wiring board 280 instead of the first flexible wiring board 260. It has a configuration.

As shown in FIG. 22, like the first flexible wiring board 260, the first flexible wiring board 280 includes a first bonded terminal 261P, a second bonded terminal 262P, and a plurality of first relay terminals 263P. , and a plurality of second relay terminals 264P. The first adhered terminal 261P, the first relay terminal 263P, and the second relay terminal 264P are formed of the first conductor layer 260D. The second adhered terminal 262P is formed by the second conductor layer 260E.

A second conductor layer 260E is connected to the first portion 260D1 that connects the first bonded terminal 261P and the first relay terminal 263P via a plurality of through holes 265. That is, between the first adhered terminal 261P and the first relay terminal 263P, there is an interlayer connection part in which the first conductor layer 260D and the second conductor layer 260E are electrically connected via the plurality of through holes 265. 265A is provided. In addition, in FIG. 22, the interlayer connection portion 265A is shown with a dot.

The interlayer connection portion 265A located between the first adhered terminal 261P and the first relay terminal 263P moves from the position of one end of the terminal row formed by the plurality of first relay terminals 263P to the other end in the first direction D1. It extends to the location. The interlayer connection portion 265A located between the first adhered terminal 261P and the first relay terminal 263P is provided with one or more through holes 265, for example, at least at a position adjacent to each first relay terminal 263P.

In the first portion 260D1 that connects the first adhered terminal 261P and the first relay terminal 263P, the width along the second direction D2 of the portion formed as the interlayer connection portion 265A is such that the portion is only the first conductor layer 260D. smaller than the width when formed.

The second conductor layer 260E forming the second bonded terminal 262P and the second portion 260D2 forming the second relay terminal 264P have a plurality of through holes in a portion other than the second bonded terminal 262P and the second relay terminal 264P. It is electrically connected via 265. That is, between the second adhered terminal 62P and the second relay terminal 264P, there is an interlayer connection part in which the first conductor layer 260D and the second conductor layer 260E are electrically connected via the plurality of through holes 265. 265A is provided. The interlayer connection portion 265A that connects the second adhered terminal 262P and the second relay terminal 264P is provided with one or more through holes 265, for example, at least at a position adjacent to each first relay terminal 263P.

Width along the second direction D2 of a portion of the interlayer connection portion 265A that connects the second bonded terminal 262P and the second relay terminal 264P, which is located on the opposite side of the second bonded terminal 262P with respect to the second relay terminal 264P. is smaller than the width when the portion is formed only of the first conductor layer 260D.

The first flexible wiring board 280 connects the first bonded terminal 261P and the first relay terminal 263P and the second bonded terminal 262P and the second relay terminal 264P by an interlayer connection portion 265A. There is. In the interlayer connection portion 265A, the current branches and flows into the first conductor layer 260D and the second conductor layer 260E. Therefore, even if the width of the interlayer connection portion 265A in the second direction D2 is reduced, heat generation due to energization is less likely to occur.

In other words, by connecting the first bonded terminal 261P and the first relay terminal 263P with the interlayer connection portion 265A, the first bonded terminal 261P and the first relay terminal 263P are connected to each other by the interlayer connection portion 265A, thereby suppressing an increase in the amount of heat generated due to energization. The width W6 along the two directions D2 can be made smaller than the width W5 of the first flexible wiring board 260. Similarly, by connecting the second bonded terminal 262P and the second relay terminal 264P with the interlayer connection portion 265A, the width W6 of the first flexible wiring board 280 can be reduced to a 1. The width W5 of the flexible wiring board 60 can be made smaller than the width W5 of the flexible wiring board 60.

Note that the interlayer connection portion 265A between the second bonded terminal 262P and the second relay terminal 264P is located at least on the side opposite to the second bonded terminal 262P with respect to the second relay terminal 264P (the second bonded terminal 265A in FIG. 22). It may be provided at a position on the right side of the paper with respect to the adhesive terminal 262P. The interlayer connection portion 265A may extend along the first direction D1 from the position of one end of the terminal row constituted by the plurality of second relay terminals 264P to the position of the other end.

[Advantages of the fourth embodiment]
According to the fourth embodiment, the following advantages can be obtained.
(4-1) By connecting the first bonded terminal 261P and the first relay terminal 263P with the interlayer connection portion 265A, the first flexible wiring board 280 can suppress an increase in heat generation due to energization. The width W6 of the first flexible wiring board 260 can be made smaller than the width W5 of the first flexible wiring board 260. Similarly, by connecting the second bonded terminal 262P and the second relay terminal 264P with the interlayer connection portion 265A, the width W6 of the first flexible wiring board 280 can be reduced to a 1 flexible wiring board 260. Thereby, in a state where the flexible wiring board unit 250 is connected to the light control sheet 10, the length by which the first flexible wiring board 280 protrudes from the light control sheet 10 can be shortened. Furthermore, even if the flexible wiring board unit 250 includes the first flexible wiring board 280, the above (1-1), (3-1) to (3-3), and (3-5) are not met. You can get similar benefits.

[Fifth embodiment]
Next, a light control unit according to a fifth embodiment will be described with reference to FIGS. 23 and 24. Note that the light control unit of the fifth embodiment is similar to the light control unit 201 of the third embodiment, except that it includes a first flexible wiring board 281 instead of the first flexible wiring board 260. It has a configuration.

As shown in FIG. 23, like the first flexible wiring board 260, the first flexible wiring board 281 includes a first bonded terminal 261P, a second bonded terminal 262P, and a plurality of first relay terminals 263P. , and a plurality of second relay terminals 264P. Note that the first relay terminal 263P and the second relay terminal 264P are located in the first flexible wiring board 281 where the first bonded terminal 261P and the second bonded terminal 262P are located in the second direction D2. located at a second end opposite to the end of the second end. Further, in the first relay terminal 263P and the second relay terminal 264P, the tips of the comb-like tooth terminals extend toward the opposite side from the first bonded terminal 261P and the second bonded terminal 262P.

The first bonded terminal 261P, the first relay terminal 263P, and the second relay terminal 264P are formed by the first conductor layer 260D. The second adhered terminal 262P is formed by the second conductor layer 260E. In addition, in FIG. 23, the outline of the portion of the first conductor layer 260D that overlaps with the first outer insulating layer 260A is shown with a broken line.

In the first portion 260D1 that connects the first bonded terminal 261P and the first relay terminal 263P, the first bonded terminal 261P is located at one end in the second direction D2, and each first bonded terminal is located at the other end in the second direction D2. A relay terminal 263P is located there. The first conductor layer 260D extends in the second direction D2 from the first adhered terminal 261P toward each first relay terminal 263P.

The second portion 260D2 forming the second relay terminal 264P is arranged discontinuously. In other words, the second portions 260D2 are provided in the same number as the plurality of second relay terminals 264P. Each second portion 260D2 extends from the second relay terminal 264P toward the second bonded terminal 262P along the second direction D2.

As shown in FIG. 24, in the second conductor layer 260E forming the second adhered terminal 262P, the second adhered terminal 262P is located at one end in the second direction D2, and the other end in the second direction D2 is located at the second conductor layer 260E. It overlaps with each second portion 260D2 forming two relay terminals 264P. In addition, in FIG. 24, the outline of the second conductor layer 260E is shown with a broken line.

A portion where the second conductor layer 260E and each second portion 260D2 overlap is electrically connected to the second conductor layer 260E and each second portion 260D2 via a plurality of through holes 265 to form an interlayer connection portion 265A. do. That is, in the first flexible wiring board 281, an interlayer connection portion 265A is provided for each second relay terminal 264P. In the first flexible wiring board 281, the second relay terminal 264P and the interlayer connection portion 265A are connected to the second bonded terminal 265A such that the interlayer connection portion 265A is located on the second bonded terminal 262P side with respect to the second relay terminal 264P. They are arranged in parallel along the direction D2.

A portion of the second conductor layer 260E that connects the second bonded terminal 262P and each interlayer connection portion 265A connects the first bonded terminal 261P of the first portion 260D1 with each first relay via the inner insulating layer 260C. It overlaps with the part connecting with the terminal 263P. The second conductor layer 260E and second portion 260D2 that connect the second bonded terminal 262P and each second relay terminal 264P are arranged between the second bonded terminal 262P and each second relay terminal 264P in the second direction D2. Located in

According to the arrangement of the first conductor layer 260D and the second conductor layer 260E as described above, the first relay terminal 263P and the second relay terminal 264P are arranged in the second direction D2 in the first flexible wiring board 281. It can be placed at one end (edge). In this case, compared to the first flexible wiring board 260 of the third embodiment, the wiring path connecting the second bonded terminal 262P and each second relay terminal 264P can be shortened. As a result, the width W7 of the first flexible wiring board 281 along the second direction D2 can be made smaller than the width W5 of the first flexible wiring board 260.

[Advantages of the fifth embodiment]
According to the fifth embodiment, the following advantages can be obtained.
(5-1) By providing the interlayer connection portion 265A for each second relay terminal 264P, the width W7 of the first flexible wiring board 281 along the second direction D2 is changed to the width W5 of the first flexible wiring board 260. It can be made smaller than. As a result, when the flexible wiring board unit 250 is connected to the light control sheet 10, the length by which the first flexible wiring board 281 protrudes from the light control sheet 10 can be reduced. Further, even if the flexible wiring board unit 250 includes the first flexible wiring board 281, the above (1-1), (3-1) to (3-3), and (3-5) are not met. You can get similar benefits.

[Sixth embodiment]
Next, a light control unit of a sixth embodiment will be described with reference to FIGS. 25 and 26. Note that the light control unit of the sixth embodiment is similar to the light control unit 201 of the third embodiment, except that it includes a first flexible wiring board 282 instead of the first flexible wiring board 260. It has a configuration.

As shown in FIG. 25, the first flexible wiring board 282, like the first flexible wiring board 260, includes a first bonded terminal 261P, a second bonded terminal 262P, and a plurality of first relay terminals 263P. , and a plurality of second relay terminals 264P.

Note that the first relay terminal 263P and the second relay terminal 264P are located in the first flexible wiring board 282 where the first bonded terminal 261P and the second bonded terminal 262P are located in the second direction D2. located at a second end opposite to the end of the second end. Further, in the first relay terminal 263P and the second relay terminal 264P, the tips of the comb-like tooth terminals extend toward the opposite side from the first bonded terminal 261P and the second bonded terminal 262P. Further, in the first flexible wiring board 282 of the sixth embodiment, the pitch P2 in which the first relay terminals 263P and the second relay terminals 264P are arranged alternately is the same as that of the first flexible wiring board 262 of the third embodiment. pitch P2. Therefore, the pitch P3 from the center of the third relay terminal 271P to the center of the fourth relay terminal 272P on the second flexible wiring board 270 is larger in the sixth embodiment than in the third embodiment. Become.

The first bonded terminal 261P, the first relay terminal 263P, and the second relay terminal 264P are formed by the first conductor layer 260D. The second adhered terminal 262P is formed by the second conductor layer 260E. Note that in FIG. 25, the outline of a portion of the first conductor layer 260D that overlaps with the first outer insulating layer 260A is shown with a broken line.

The second portion 260D2 forming the second relay terminal 264P is arranged discontinuously. In other words, the second portions 260D2 are provided in the same number as the plurality of second relay terminals 264P. Each second portion 260D2 extends along the first direction D1 from the second relay terminal 264P toward the first relay terminals 263P located on both sides of the second relay terminal 264P.

As shown in FIG. 26, in the second conductor layer 260E forming the second adhered terminal 262P, the second adhered terminal 262P is located at one end in the second direction D2, and the other end in the second direction D2 is located at the second conductor layer 260E. It overlaps with each second portion 260D2 forming two relay terminals 264P. In addition, in FIG. 26, the outline of the second conductor layer 260E is shown with a broken line.

A portion where the second conductor layer 260E and each second portion 260D2 overlap is electrically connected to the second conductor layer 260E and each second portion 260D2 via a plurality of through holes 265 to form an interlayer connection portion 265A. do. That is, in the first flexible wiring board 282, an interlayer connection portion 265A is provided for each second relay terminal 264P. Each interlayer connection portion 265A is provided adjacent to both ends of each second relay terminal 264P in the first direction D1. For example, the interlayer connection portion 265A is located between two first relay terminals 263P so as to sandwich the second relay terminal 264P. Note that the interlayer connection portion 265A may be provided adjacent to at least one end of each second relay terminal 264P in the first direction D1.

A portion of the second conductor layer 260E that connects the second bonded terminal 262P and each interlayer connection portion 265A connects the first bonded terminal 261P of the first portion 260D1 with each first relay via the inner insulating layer 260C. It overlaps with the part connecting with the terminal 263P.

According to the arrangement of the first conductor layer 260D and the second conductor layer 260E as described above, the first relay terminal 263P and the second relay terminal 264P are arranged in the second direction D2 in the first flexible wiring board 282. Can be placed at one end. In this case, compared to the first flexible wiring board 260 of the third embodiment, the wiring path connecting the second bonded terminal 262P and each second relay terminal 264P can be shortened. As a result, the width W8 of the first flexible wiring board 282 along the second direction D2 can be made smaller than the width W5 of the first flexible wiring board 260.

Furthermore, in the first flexible wiring board 282 of the sixth embodiment, the second relay terminal 264P and the interlayer connection portion 265A are arranged in parallel along the first direction D1. Therefore, compared to the first flexible wiring board 281 of the fifth embodiment, the interlayer connection part 265A is not interposed between the second adhered terminal 262P and the second relay terminal 264P in the second direction D2. Therefore, the width W8 can be made smaller than the width W7.

Note that in the first flexible wiring board 281 of the fifth embodiment, compared to the first flexible wiring board 282 of the sixth embodiment, there is a gap between the first relay terminal 263P and the second relay terminal 264P. The pitch P2 can be reduced by the amount that the interlayer connection portion 265A is not present. Therefore, in the first direction D1, the arrangement of the second flexible wiring board 270 with respect to the first flexible wiring board 281 can be changed every shorter distance.

[Advantages of the sixth embodiment]
According to the sixth embodiment, the following advantages can be obtained.
(6-1) By providing the interlayer connection portion 265A for each second relay terminal 264P, the width W8 of the first flexible wiring board 282 along the second direction D2 is changed to the width W5 of the first flexible wiring board 260. It can be made smaller than. As a result, when the flexible wiring board unit 250 is connected to the light control sheet 10, the length by which the first flexible wiring board 282 protrudes from the light control sheet 10 can be reduced. Further, even if the flexible wiring board unit 250 includes the first flexible wiring board 282, the above (1-1), (3-1) to (3-3), and (3-5) are not met. You can get similar benefits.

(6-2) By arranging the second relay terminal 264P and the interlayer connection portion 265A in parallel along the first direction D1, the width W4 of the first flexible wiring board 282 along the second direction D2 is It can be made smaller than the width W3 of the flexible wiring board 281.

[Seventh embodiment]
Next, a light control unit according to a seventh embodiment will be described with reference to FIGS. 27 to 29. Note that the light control unit of the seventh embodiment includes a first flexible wiring board 283 and a second flexible wiring board 290 instead of the first flexible wiring board 260 and the second flexible wiring board 270. It has the same configuration as the light control unit 201 of the third embodiment except that it includes the following.

As shown in FIG. 27, the first flexible wiring board 283 includes a first bonded terminal 261P, a second bonded terminal 262P, a plurality of first relay terminals 263P, and a plurality of second relay terminals 264P. The first adhered terminal 261P and the plurality of first relay terminals 263P face the first space side (the front side of the paper in FIG. 27) defined by the light control sheet 10. The second adhered terminal 262P and the plurality of second relay terminals 264P face the second space side (the back side of the paper in FIG. 27) defined by the light control sheet 10. Therefore, the first relay terminal 263P and the second relay terminal 264P face opposite directions.

The first bonded terminal 261P and the first relay terminal 263P are formed by the first conductor layer 260D. Note that in FIG. 27, the outline of a portion of the first conductor layer 260D that overlaps with the first outer insulating layer 260A is shown with a broken line. The second adhered terminal 262P and the second relay terminal 264P are formed by the second conductor layer 260E. The second adhered terminal 262P and the second relay terminal 264P are portions of the second conductor layer 260E exposed toward the second space from the second outer insulating layer 260B.

Each of the first relay terminals 263P and each of the second relay terminals 264P is connected to a first terminal in the first flexible wiring board 283 where the first to-be-bonded terminal 261P and the second to-be-bonded terminal 262P are located in the second direction D2. located at a second end opposite to the end of the second end. Further, in the first relay terminal 263P and the second relay terminal 264P, the tips of the comb-like tooth terminals extend toward the opposite side from the first bonded terminal 261P and the second bonded terminal 262P.

In the first conductor layer 260D, the first bonded terminal 261P is located at one end in the second direction D2, and each first relay terminal 263P is located at the other end in the second direction D2. The first conductor layer 260D extends in the second direction D2 from the first adhered terminal 261P toward each first relay terminal 263P.

As shown in FIG. 28, in the second conductor layer 260E, the second adhered terminal 262P is located at one end in the second direction D2, and each second relay terminal 264P is located at the other end in the second direction D2. In addition, in FIG. 28, the outline of the second conductor layer 260E is shown with a broken line. The second conductor layer 260E extends in the second direction D2 from the second adhered terminal 262P toward each second relay terminal 264P.

A portion of the second conductor layer 260E that connects the second bonded terminal 262P and each second relay terminal 264P connects the first bonded terminal 261P of the first conductor layer 260D and each of the second relay terminals 264P through the inner insulating layer 260C. It overlaps with the part connecting with the 1 relay terminal 263P.

According to the arrangement of the first conductor layer 260D and the second conductor layer 260E as described above, the first relay terminal 263P and the second relay terminal 264P are arranged in the second direction D2 in the first flexible wiring board 283. Can be placed at one end. In this case, compared to the first flexible wiring board 260 of the third embodiment, the wiring path connecting the second bonded terminal 262P and each second relay terminal 264P can be shortened. As a result, the width W9 of the first flexible wiring board 283 along the second direction D2 can be made smaller than the width W5 of the first flexible wiring board 260.

In the case of the first flexible wiring board 283, a structure such as a through hole 265 for electrically connecting the first conductor layer 260D and the second conductor layer 260E is unnecessary. Therefore, the flexibility and bending resistance of the first flexible wiring board 283 can be improved.

As shown in FIG. 29, the second flexible wiring board 290 includes a third outer insulating layer 290A, a fourth outer insulating layer 290B, an inner insulating layer 290C, a third conductor layer 290D, and a fourth conductor layer 290E. . The inner insulating layer 290C is located between the third outer insulating layer 290A and the fourth outer insulating layer 290B. The third outer insulating layer 290A is located on the side of the first space defined by the light control sheet 10 (the back side of the paper in FIG. 29) with respect to the inner insulating layer 290C. The fourth outer insulating layer 290B is located on the second space side (the front side of the paper in FIG. 29) defined by the light control sheet 10 with respect to the inner insulating layer 290C. The third outer insulating layer 290A, the fourth outer insulating layer 290B, and the inner insulating layer 290C are insulating resin films, and are made of polyimide, for example.

The third conductor layer 290D is located between the third outer insulating layer 290A and the inner insulating layer 290C. The fourth conductor layer 290E is located between the fourth outer insulating layer 290B and the inner insulating layer 290C. The third conductor layer 290D and the fourth conductor layer 290E are conductive metal films, and are made of copper foil, for example. The second flexible wiring board 290 having a double-sided structure includes a third outer insulating layer 290A, a third conductor layer 290D, an inner insulating layer 290C, a fourth conductor layer 290E, and a fourth outer insulating layer 290B. They are formed by laminating in this order.

In the second flexible wiring board 290, the third relay terminal 271P, the first power terminal 273P, and the second power terminal 274P have the fourth conductor layer 290E directed from the fourth outer insulating layer 290B toward the second space side. This is the exposed part. In the second flexible wiring board 290, the fourth relay terminal 272P is a portion where the third conductor layer 290D is exposed from the third outer insulating layer 290A toward the first space side. Therefore, the third relay terminal 271P and the fourth relay terminal 272P face opposite directions.

The third relay terminal 271P and the first power supply terminal 273P are electrically connected inside the second flexible wiring board 290 via the fourth conductor layer 290E. Note that the portion of the fourth conductor layer 290E that forms the third relay terminal 271P and the first power terminal 273P is electrically insulated from the portion that forms the second power terminal 274P.

The third conductor layer 290D forming the fourth relay terminal 272P is electrically connected to the portion of the fourth conductor layer 290E forming the second power supply terminal 274P via a plurality of through holes 291. Therefore, the fourth relay terminal 272P and the second power supply terminal 274P are electrically connected inside the second flexible wiring board 290 via the third conductor layer 290D, the fourth conductor layer 290E, and the through hole 291. has been done. Note that the number of through holes 291 may be one or two or more.

In the case of the seventh embodiment, the third relay terminal 271P is connected to one of the first relay terminal 263P and the second relay terminal 264P, and the other of the first relay terminal 263P and the second relay terminal 264P is connected. Connection of the fourth relay terminal 272P to each terminal is performed separately.

[Advantages of the seventh embodiment]
According to the seventh embodiment, the following advantages can be obtained.
(7-1) In the first flexible wiring board 283, the first bonded terminal 261P and the first relay terminal 263P are formed of the first conductor layer 260D, and the second bonded terminal 262P and the second relay terminal 264P are formed by the first conductor layer 260D. and are formed by the second conductor layer 260E. Thereby, the width W9 of the first flexible wiring board 283 along the second direction D2 can be made smaller than the width W5 of the first flexible wiring board 260. As a result, when the flexible wiring board unit 250 is connected to the light control sheet 10, the length by which the first flexible wiring board 283 protrudes from the light control sheet 10 can be reduced. Furthermore, even with the flexible wiring board unit 250 including the first flexible wiring board 283, advantages similar to the above (1-1) and (3-1) can be obtained.

(7-2) In the first flexible wiring board 283, a structure such as the through hole 265 for electrically connecting the first conductor layer 260D and the second conductor layer 260E is unnecessary. Therefore, the flexibility and bending resistance of the first flexible wiring board 283 can be improved.

[Examples of changes to the third to seventh embodiments]
Note that the third to seventh embodiments described above can be implemented with the following modifications. In addition, the modification examples shown below can be combined within a technically consistent range.

- In the third to seventh embodiments, the shapes of the reference part 266 and the positioning part 275 may be such that the two relay terminals to be connected can be appropriately arranged based on the arrangement of the positioning part 275 with respect to the reference part 266. good. Further, if high precision is not required for the arrangement of the third relay terminal 271P and the fourth relay terminal 272P with respect to the first relay terminal 263P and the second relay terminal 264P, the reference portion 266 and the positioning portion 275 may not be provided. good.

- In the third to seventh embodiments, the pitch P3 from the center of the third relay terminal 271P to the center of the fourth relay terminal 272P is larger than the pitch P2 between the first relay terminal 263P and the second relay terminal 264P. You can. For example, the pitch P3 may be an odd multiple (excluding 1) of the pitch P2. That is, when the third relay terminal 271P is electrically connected to one of the first relay terminal 263P and the second relay terminal 264P, the fourth relay terminal 272P is connected to the first relay terminal 263P and the second relay terminal 264P. Any configuration is sufficient as long as it is electrically connected to the other one.

In the third to sixth embodiments, the first power terminal 73P and the second power terminal 274P of the second flexible wiring board 270 may face opposite directions. In this case, in the second flexible wiring board 270, a through hole is provided between the third relay terminal 271P and the first power terminal 273P or between the fourth relay terminal 272P and the second power terminal 274P. . In this case, the degree of freedom in connecting the first power terminal 273P and the second power terminal 274P to the external power source 1A is increased.

- In the seventh embodiment, the first power terminal 273P and the second power terminal 274P of the second flexible wiring board 290 may face opposite directions. For example, the second power terminal 274P may be formed of the third conductor layer 290D. In this case, the first power terminal 273P faces the second space, while the second power terminal 274P faces the first space. The fourth relay terminal 272P and the second power supply terminal 274P are electrically connected inside the second flexible wiring board 290 via the third conductor layer 290D. In this case, in the second flexible wiring board 290, a structure such as a through hole 291 for electrically connecting the third conductor layer 290D and the fourth conductor layer 290E is unnecessary. Therefore, the flexibility and bending resistance of the second flexible wiring board 290 can be improved.

- In the third to seventh embodiments, among the plurality of first relay terminals 263P, the first relay terminals 263P that are not connected to the third relay terminal 271P have the first outer insulating layer 260A located on the outer surface side not removed. Additionally, it may be covered with a first outer insulating layer 260A. In other words, among the plurality of first relay terminals 263P, at least the first relay terminal 263P connected to the third relay terminal 271P should be exposed from the first outer insulating layer 260A. By covering the first relay terminal 263P that is not connected to the third relay terminal 271P with the first outer insulating layer 260A, it is possible to simplify the work of sealing the first relay terminal 263P that is not connected to the third relay terminal 271P. Note that similar changes can be made to the second relay terminals 264P that are not connected to the fourth relay terminal 272P among the plurality of second relay terminals 264P.

[Examples of changes to the first to seventh embodiments]
Note that the first to seventh embodiments described above can be implemented with the following modifications. In addition, the modification examples shown below can be combined within a technically consistent range.

- In the first to seventh embodiments, the first transparent electrode sheet 20 may include other functional layers such as an ultraviolet shielding layer, an infrared shielding layer, an alignment layer, an adhesive layer, and a protective layer. The second transparent electrode sheet 30 may include other functional layers such as an ultraviolet shielding layer, an infrared shielding layer, an alignment layer, an adhesive layer, and a protective layer.

- In the first to seventh embodiments, the light control sheet 10 is not limited to a rectangular shape, and may have a geometric shape other than a rectangular shape such as a polygonal shape, a circular shape, an elliptical shape, or an irregular shape other than a geometric shape. But that's fine. The light control sheet 10 is not limited to a two-dimensional planar shape, but may have a curved shape such as a cylindrical shape, a spherical shape, or a wavy shape.

Claims

A flexible wiring board unit,
a first flexible wiring board extending in a first direction;
a second flexible wiring board extending in a second direction;
The second flexible wiring board is arranged such that the first direction and the second direction intersect at a first end of the second flexible wiring board in the second direction. It is configured to be electrically connected to a flexible wiring board,
The first flexible wiring board includes a first bonded terminal and a second bonded terminal arranged in the first direction,
The first bonded terminal and the second bonded terminal are configured to be connected to a power supply target,
The second flexible wiring board includes a first power terminal and a second power terminal located at a second end opposite to the first end in the second direction,
The first power terminal and the second power terminal are configured to be connected to an external power source. The flexible wiring board unit.
The first flexible wiring board includes a first relay terminal that is electrically connected to the first bonded terminal, and a first relay terminal that is electrically connected to the first bonded terminal, inside the first flexible wiring board. a second relay terminal electrically connected to the second bonded terminal inside;
The second flexible wiring board includes a third relay terminal and a fourth relay terminal located at the first end,
Inside the second flexible wiring board, the third relay terminal is electrically connected to the first power supply terminal, and inside the second flexible wiring board, the fourth relay terminal is electrically connected to the first power supply terminal. 2 electrically connected to the power terminal,
The first flexible wiring board and the second flexible wiring board are formed by laminating an insulating layer and a conductor layer,
The second flexible wiring board has fewer layers than the first flexible wiring board,
In the first flexible wiring board, the first bonded terminal faces in a direction opposite to the second bonded terminal, the first relay terminal, and the second relay terminal,
In the second flexible wiring board, the third relay terminal, the fourth relay terminal, the first power terminal, and the second power terminal face the same direction,
the first direction and the second direction such that the third relay terminal is electrically connected to the first relay terminal, and the fourth relay terminal is electrically connected to the second relay terminal. The flexible wiring board according to claim 1, wherein the relative position of the second relay terminal with respect to the first relay terminal is equal to the relative position of the fourth relay terminal with respect to the third relay terminal in a plane including the direction. unit.
The flexible wiring board unit according to claim 2, wherein the second direction is orthogonal to the first direction.
The flexibility according to claim 3, wherein the second flexible wiring board is connected to the first flexible wiring board at the center of the first flexible wiring board in the first direction. Wiring board unit.
The second flexible wiring board is connected to the first flexible wiring board at a position offset from the center of the first flexible wiring board toward one end in the first direction. The flexible wiring board unit according to claim 3.
The first flexible wiring board includes a first relay terminal and a second relay terminal arranged in the second direction,
The first relay terminal includes a plurality of first tooth terminals arranged at a constant pitch in the first direction,
The plurality of first tooth terminals are electrically connected to the first bonded terminal inside the first flexible wiring board,
The second relay terminal includes a plurality of second tooth terminals arranged at the constant pitch in the first direction,
The plurality of second tooth terminals are electrically connected to the second bonded terminal inside the first flexible wiring board,
The second flexible wiring board includes:
comprising a third relay terminal and a fourth relay terminal located at the first end,
The third relay terminal includes a plurality of third tooth terminals arranged at the constant pitch in the first direction,
The plurality of third tooth terminals are electrically connected to the first power terminal inside the second flexible wiring board,
The fourth relay terminal includes a plurality of fourth tooth terminals arranged at the constant pitch in the first direction,
The plurality of fourth tooth terminals are electrically connected to the second power terminal inside the second flexible wiring board,
The number of the first tooth terminals is greater than the number of the third tooth terminals,
The number of the second tooth terminals is greater than the number of the fourth tooth terminals,
such that when each third tooth terminal is electrically connected to any one of the plurality of first tooth terminals, each fourth tooth terminal is electrically connected to any one of the plurality of second tooth terminals, The flexible wiring board unit according to claim 1, wherein the fourth relay terminal is arranged with respect to the third relay terminal.
In the first flexible wiring board,
the first relay terminal and the second relay terminal face the same direction,
In the second flexible wiring board,
The flexible wiring board unit according to claim 6, wherein the third relay terminal and the fourth relay terminal face the same direction.
In the first flexible wiring board,
The first bonded terminal faces the same direction as the first relay terminal and the second relay terminal,
The second bonded terminal faces in a direction opposite to the first relay terminal and the second relay terminal,
In the second flexible wiring board,
The flexible wiring board unit according to claim 7, wherein the first power terminal and the second power terminal face the same direction as the third relay terminal and the fourth relay terminal.
Among the plurality of third tooth terminals, the third tooth terminals located at each end in the first direction include a positioning portion,
Each first tooth terminal includes a reference portion,
With respect to the positioning part provided in the third tooth terminal located at each end in the first direction, the reference part provided in the first tooth terminal connected to the third tooth terminal is located in the first direction and The flexible device according to any one of claims 6 to 8, wherein when properly positioned in each of the second directions, the first tooth terminal is properly positioned with respect to the third tooth terminal. sexual wiring board unit.
The first flexible wiring board includes a plurality of first relay terminals electrically connected to the first bonded terminals and the first flexible wiring inside the first flexible wiring board. A plurality of second relay terminals electrically connected to the second bonded terminal inside the substrate,
In the first direction, the first relay terminals and the second relay terminals are arranged alternately at a constant pitch and in a row,
The second flexible wiring board includes a third relay terminal and a fourth relay terminal located at the first end,
Inside the second flexible wiring board, the third relay terminal and the first power supply terminal are electrically connected, and inside the second flexible wiring board, the fourth relay terminal and the electrically connected to the second power supply terminal;
When the third relay terminal is electrically connected to one of the first relay terminal and the second relay terminal, the fourth relay terminal is connected to one of the first relay terminal and the second relay terminal. The flexible wiring board unit according to claim 1, wherein the fourth relay terminal is arranged with respect to the third relay terminal so as to be electrically connected to the other one of the flexible wiring board units.
In the first flexible wiring board,
the first relay terminal and the second relay terminal face the same direction,
In the second flexible wiring board,
The flexible wiring board unit according to claim 10, wherein the third relay terminal and the fourth relay terminal face the same direction.
In the first flexible wiring board,
The first bonded terminal faces the same direction as the first relay terminal and the second relay terminal,
The second bonded terminal faces in a direction opposite to the first relay terminal and the second relay terminal,
In the second flexible wiring board,
The flexible wiring board unit according to claim 11, wherein the first power terminal and the second power terminal face the same direction as the third relay terminal and the fourth relay terminal.
In the first flexible wiring board,
The first relay terminal and the second relay terminal face opposite directions,
The first bonded terminal faces the same direction as the first relay terminal,
The second bonded terminal faces the same direction as the second relay terminal,
In the second flexible wiring board,
The flexible wiring board unit according to claim 10, wherein the third relay terminal and the fourth relay terminal face opposite directions.
A light control unit,
a light control sheet including an edge extending in a first direction;
a flexible wiring board unit adhered to the edge;
The light control sheet is
a first transparent electrode sheet;
a second transparent electrode sheet;
a light control layer located between the first transparent electrode sheet and the second transparent electrode sheet,
A portion of the first transparent electrode sheet exposed from the light control layer and the second transparent electrode sheet is a first electrode terminal,
A portion of the second transparent electrode sheet exposed from the light control layer and the first transparent electrode sheet is a second electrode terminal,
the first electrode terminal and the second electrode terminal are arranged along the first direction at the edge;
The flexible wiring board unit includes:
a first flexible wiring board extending in the first direction;
a second flexible wiring board extending in a second direction;
The second flexible wiring board is arranged such that the first direction and the second direction intersect at a first end of the second flexible wiring board in the second direction. It is configured to be electrically connected to a flexible wiring board,
The first flexible wiring board includes a first bonded terminal and a second bonded terminal arranged in the first direction,
The first adhered terminal is configured to be electrically connected to the first electrode terminal,
The second adhered terminal is configured to be electrically connected to the second electrode terminal,
The second flexible wiring board includes a first power terminal and a second power terminal located at a second end opposite to the first end in the second direction,
The first power terminal and the second power terminal are configured to be connected to an external power source. A dimming unit.
The first flexible wiring board includes a first relay terminal that is electrically connected to the first bonded terminal, and a first relay terminal that is electrically connected to the first bonded terminal, inside the first flexible wiring board. a second relay terminal electrically connected to the second bonded terminal inside;
The second flexible wiring board includes a third relay terminal and a fourth relay terminal located at the first end,
Inside the second flexible wiring board, the third relay terminal is electrically connected to the first power supply terminal, and inside the second flexible wiring board, the fourth relay terminal is electrically connected to the first power supply terminal. 2 electrically connected to the power terminal,
The first flexible wiring board and the second flexible wiring board are formed by laminating an insulating layer and a conductor layer,
The second flexible wiring board has fewer layers than the first flexible wiring board,
In the first flexible wiring board, the first bonded terminal faces in a direction opposite to the second bonded terminal, the first relay terminal, and the second relay terminal,
In the second flexible wiring board, the third relay terminal, the fourth relay terminal, the first power terminal, and the second power terminal face the same direction,
the first direction and the second direction such that the third relay terminal is electrically connected to the first relay terminal, and the fourth relay terminal is electrically connected to the second relay terminal. The light control unit according to claim 14, wherein the relative position of the second relay terminal with respect to the first relay terminal is equal to the relative position of the fourth relay terminal with respect to the third relay terminal in a plane including the direction.
The first flexible wiring board includes a first relay terminal and a second relay terminal arranged in the second direction,
The first relay terminal includes a plurality of first tooth terminals arranged at a constant pitch in the first direction,
The plurality of first tooth terminals are electrically connected to the first bonded terminal inside the first flexible wiring board,
The second relay terminal includes a plurality of second tooth terminals arranged at the constant pitch in the first direction,
The plurality of second tooth terminals are electrically connected to the second bonded terminal inside the first flexible wiring board,
The second flexible wiring board includes a third relay terminal and a fourth relay terminal located at the first end,
The third relay terminal includes a plurality of third tooth terminals arranged at the constant pitch in the first direction,
The plurality of third tooth terminals are electrically connected to the first power terminal inside the second flexible wiring board,
The fourth relay terminal includes a plurality of fourth tooth terminals arranged at the constant pitch in the first direction,
The plurality of fourth tooth terminals are electrically connected to the second power terminal inside the second flexible wiring board,
The number of the first tooth terminals is greater than the number of the third tooth terminals,
The number of the second tooth terminals is greater than the number of the fourth tooth terminals,
Claim 14: When each third tooth terminal is electrically connected to any one of the plurality of first tooth terminals, each fourth tooth terminal is electrically connected to any one of the plurality of second tooth terminals. The dimming unit described in .
The first flexible wiring board includes a plurality of first relay terminals electrically connected to the first bonded terminals and the first flexible wiring inside the first flexible wiring board. A plurality of second relay terminals electrically connected to the second bonded terminal inside the substrate,
In the first direction, the first relay terminals and the second relay terminals are arranged alternately at a constant pitch and in a row,
The second flexible wiring board includes a third relay terminal and a fourth relay terminal located at one end in the second direction,
Inside the second flexible wiring board, the third relay terminal and the first power supply terminal are electrically connected, and inside the second flexible wiring board, the fourth relay terminal and the electrically connected to the second power supply terminal;
The third relay terminal is electrically connected to one of the first relay terminal and the second relay terminal, and the fourth relay terminal is electrically connected to the other of the first relay terminal and the second relay terminal. The light control unit according to claim 14, wherein the light control unit is electrically connected.